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  #1  
Old 12-04-2009, 08:21 PM
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Default hammerhead gy6 problems

I just installed a stage 1 stator on gy6 hammerhead go kart and now it starts ,run at an idle but at faster throttle engine starts shaking and missing and eventually die, any Ideas
  #2  
Old 12-05-2009, 04:22 AM
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pull the flywheel back off and check the keyway, sounds like its sheared off
  #3  
Old 12-05-2009, 01:57 PM
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do you think since i upgraded my stator that i should upgrade my cdi unit or do you think this wouldn't have anything to do with this, Also I checked the key on the stator it was fine,and also the carberator is running rich.
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Old 12-05-2009, 02:39 PM
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what size jet do you have in now? if the plug shows black after a wot run then its to rich and need to down a size on the main jet. what is a stage1 stator? did you install an 8 pole stator
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Old 12-05-2009, 03:49 PM
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yes its an 8 pole stator
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Old 12-05-2009, 03:52 PM
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how do you know what size jet is in the carb?
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Old 12-05-2009, 04:03 PM
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It kinda depends on where. I live in TN and a 130 works good for me. Where do you live?
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  #8  
Old 12-05-2009, 07:02 PM
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indiana
  #9  
Old 12-05-2009, 07:26 PM
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another question could a bad ignition switch cause a weak spark?
  #10  
Old 12-05-2009, 08:06 PM
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In Indiana a 130 -135 should work well. By ignition switch, do you mean ignition coil?
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  #11  
Old 12-05-2009, 08:14 PM
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no the switch
  #12  
Old 12-05-2009, 08:14 PM
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by the way what is a spark arrester and what does it do?
  #13  
Old 12-05-2009, 08:15 PM
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Are you talking about the 2 way button on the dash?
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  #14  
Old 12-05-2009, 08:16 PM
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The spark arrestor is the screen mesh at the very end of the exhaust. It prevents any fire or flame from coming out of it. Removing it helps the engine breathe easier.
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  #15  
Old 12-05-2009, 08:17 PM
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However it is illegal to ride at public place without one.
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  #16  
Old 12-05-2009, 08:20 PM
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No its a key ignition, I guess what I'm asking is, how do I check for weak spark?
  #17  
Old 12-05-2009, 08:23 PM
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I'm not real sure what a good spark looks like, but I would take the spark plug out. Then put the ignition coil on and ground the other end of the plug. I guess just make sure it looks good, not a dull spark. I would not expect it to be a weak spark though because it runs a good idol and runs good up to a certain speed.
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  #18  
Old 12-05-2009, 08:24 PM
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My buggy Is a hammerhead 150 cc it starts, idles fine but if you go to throttle it up it misses and wants to die if I slowly move the trottle I can get about have throttle before it start missing ,but if I do get it to run have throttle it only runs ok for short while.
  #19  
Old 12-05-2009, 08:29 PM
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For a second I thought it might be bad fuel, but bad fuel wouldn't run a good idol. Have you cleaned out your jets recently?
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  #20  
Old 12-05-2009, 08:30 PM
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yes, I don't what size it is but its running rich
  #21  
Old 12-05-2009, 08:34 PM
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Did you check the pilot jet as well?
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  #22  
Old 12-05-2009, 08:35 PM
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do you think if the buggy start and Idles well I could eliminate the ignition part and narrow it down to a carb problem?
  #23  
Old 12-05-2009, 08:36 PM
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I went through the whole carb.
  #24  
Old 12-05-2009, 08:41 PM
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Yes, I would rule out the whole ignition part and focus on something else. So, it's not the carb, it's not the ignition system... I'm pretty sure it's not bad fuel.
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Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #25  
Old 12-05-2009, 08:44 PM
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just put a new plug in it, i'm stumped, may be it has to big of jet in it.
  #26  
Old 12-05-2009, 08:46 PM
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has the buggy always done this?
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Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #27  
Old 12-05-2009, 08:50 PM
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no, before the stator went bad it ran pretty good , I replaced the stator and it went down hill from there, but at least it starts now , right
  #28  
Old 12-05-2009, 08:53 PM
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there is no adjustment on the stator or pick up coil, so it can't be a timing issue . I don't know if a valve problem might cause this or not ,maybe my choke is sticking.
  #29  
Old 12-05-2009, 08:55 PM
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I'm going to post a pic in a minute and you tell me if it looks like this.
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FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
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  #30  
Old 12-05-2009, 08:58 PM
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Here it is. Tell me if your carbs air intake looks like this.
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File Type: jpg attachment.php.jpg (27.4 KB, 24 views)
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FMF Slip-On Exhaust
No Rev. CDI
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130 Main jet
1500 RPM main clutch spring
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  #31  
Old 12-05-2009, 08:58 PM
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Or if the black plunger is stuck half way or something.
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  #32  
Old 12-05-2009, 09:00 PM
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i can see the black plunger half way
  #33  
Old 12-05-2009, 09:00 PM
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so it is about half way down?
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FMF Slip-On Exhaust
No Rev. CDI
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130 Main jet
1500 RPM main clutch spring
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  #34  
Old 12-05-2009, 09:03 PM
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yes I can see it, is this good or bad
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Old 12-05-2009, 09:04 PM
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yes, I can see it
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Old 12-05-2009, 09:06 PM
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I'll post a pic of what it should look like. The one in the pic above is a bad one.
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

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  #37  
Old 12-05-2009, 09:09 PM
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If I can see the plunger ,what is it doing and how do I fix it?
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Old 12-05-2009, 09:10 PM
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Here's what it should look like.
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File Type: jpg CIMG1533_opt.jpg (64.8 KB, 42 views)
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #39  
Old 12-05-2009, 09:10 PM
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You want to be able to see it like in the latest pic I've posted.
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No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
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  #40  
Old 12-05-2009, 09:14 PM
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why is the plunger down there?
  #41  
Old 12-05-2009, 09:19 PM
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It is what helps regulate how much air gets to the engine. In the first pic where it is stuck all the way at the top, it let in too much air. It would run a perfect idol, but as soon as you open that metal plate, massive amounts of air would get in the engine. Thus, it dies. If its stuck half way, I would assume it would run a good idol and you would be able to get some good rpms out of it. But open it too much and too much air gets in the engine. Exactly where is the plunger on yours? Is it like the second pic (where it should be) or somewhere in between the first pic and the top?
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FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
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  #42  
Old 12-05-2009, 09:22 PM
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it is about exactly in half of the opening
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Old 12-05-2009, 09:24 PM
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Can you post a pic?
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My Ride:
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Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #44  
Old 12-05-2009, 09:28 PM
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it would take me a while, I have the air filter box back on it , but I do remember looking in the back of the carb today and seeing the plunger hanging half way down. you say it should not be down that far, if not how do I fix it?
  #45  
Old 12-05-2009, 09:33 PM
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You have to take the carb off and take the bowl off the top and clean/lube it.
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #46  
Old 12-05-2009, 09:36 PM
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lube what , the black plunger, and lube it with what?
  #47  
Old 12-05-2009, 09:38 PM
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do you mean the lid or top is sucking air in?
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Old 12-05-2009, 09:40 PM
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The plunger and gold needle is what I lubed with carb cleaner. And neither is sucking air in. With the plunger up too far, too much air is getting in the engine.
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ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #49  
Old 12-05-2009, 09:48 PM
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so if the plunger is down to far it is starving the engine of air and that is the reason its running rich, by the way what will lubing these parts do?
  #50  
Old 12-05-2009, 09:49 PM
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holy crap O_o
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  #51  
Old 12-05-2009, 09:49 PM
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I cleaned them with carb cleaner the other day when I took it apart.
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Old 12-05-2009, 09:49 PM
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make sure they move freely
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #53  
Old 12-05-2009, 09:50 PM
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Quote:
Originally Posted by 24evanwilson View Post
holy crap O_o
What's holy crap?
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #54  
Old 12-05-2009, 09:56 PM
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I'll take it apart tommorow and clean and lube it and see if it helps,I'll let you know how it goes, Thanks for the help
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Old 12-05-2009, 09:57 PM
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Not a prob.
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #56  
Old 12-06-2009, 03:21 AM
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the black plastic part has a needle in it that goes into the main jet, its called a slide, it should sit all the way down, when there is enough vacumn the slide moves up and pulls the needle out of the main jet some to let more fuel in to go along with the extra air thats coming in.

if you have a vacumn leak it will not get enough vacumn to operate properly or if its sticking. remove the top plate on the carb, remove the black diaphram, be careful not to damage it, clean the slide and check for scratches on the side
  #57  
Old 12-06-2009, 03:38 AM
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I doubt your ignition is causing your problem. You are describing a carb problem. How did you clean the jets? Or..what did you use to clean the jets?
  #58  
Old 12-06-2009, 09:07 AM
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Pretty much what Bige said.
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #59  
Old 12-06-2009, 11:08 AM
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I think I might be on to something , this morning I checked the needle valve in the carb and it was fine so I started moving some wires around and found that if I touch the power wire going into the cdi box the buggy dies , maybe a low rpms or Idle there is not enough vibration to lose connection but at higher rpms it starts cutting out, if I'm losing connection on the plug, can I get a replacement plug that I can slice into my harness, if not how could I fix this problem?
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Old 12-06-2009, 02:23 PM
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Can you post a pic of the wire so I can see which wire you are talking about?
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My Ride:
ASW Carbide

Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #61  
Old 12-06-2009, 02:32 PM
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you can remove the wire from the plug with a very small screw driver, it has a locking tab on it, bend the tab back up some and reinstall the wire in the plug.
  #62  
Old 12-06-2009, 03:00 PM
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after looking at the plug, it looks pretty bad, I'm going to see if the local buggy dealer has some old wire harnesses they can cut that plug off of. by the way do you think that my cdi could be failing at higher rpms ?
  #63  
Old 12-06-2009, 03:11 PM
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I wouldn't think a cdi would work at low rpms and not at higher rpms, but you will probably want to ask that to someone who knows a little more about those.
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  #64  
Old 12-06-2009, 05:44 PM
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I went ahead and messed around with the cdi plug and got it to hold and that wasn't the problem. still will not run half to full throttle, I also noticed when I hold it about 1/4 throttle it surges.
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Old 12-06-2009, 05:45 PM
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when I try to rev it up by feathering the throttle its blowing black smoke out exaust
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Old 12-06-2009, 05:48 PM
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I'm about ready to call it quits
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Old 12-06-2009, 08:07 PM
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Black smoke out of an engine? Huh... I'm stumped... I don't know what could burn black in an engine.
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  #68  
Old 12-07-2009, 04:47 AM
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black smoke is a sign of being way to rich, either the choke is bad, the slide is sticking, or the jet is to big.

with the engine cold, remove the choke, measure the brass section, turn the key to the on position for 10 minutes, remeasure the brass section. if it moved then the choke is working, if not then the choke is bad
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Old 12-07-2009, 08:56 AM
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Oh yeah... It's rich.
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Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights

CARBIDE!
  #70  
Old 12-07-2009, 09:27 AM
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have you tested the choke?
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Old 12-11-2009, 05:46 PM
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I think my prob is diaphragm in the top of carb, if I raise it up with a screw driver when it is running and give full throttle at the same time it runs like it suppose to, but I don't know why the diaphragm isn't working right?
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Old 12-11-2009, 09:11 PM
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I had a problem similar to that and the problem was that the hose that goes to the diaphram actuator (sits behind the throttle mechanism on carb and shares a T with the line the works the fuel petcock) was pinched. Damn thing drove me nuts trying to find it. The way I did find it was I took the air intake off to where I could look down the throat of the carb and actually SEE what it was trying to do. In that case, the slide wasn't going up like it should. The fix was I took that hose out of the round metal clip that it runs through. It was causing the line to pinch and not giving it what it needed vaccuum wise. Try that but your description fits too large of a pilot jet. Happened to me when I tried to use a small drill bit to clean the jet.
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Old 12-11-2009, 09:49 PM
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if its not the hoses or the jets what else could it be?
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Old 12-11-2009, 09:58 PM
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My vote is that it is still in your fuel delivery system somewnere. I need to see it via a vid or something to advise further.
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Old 12-11-2009, 10:00 PM
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There is one other thing that you could do though but you need a timing light. If it is in fact an ignition problem, you can see it in how the timing light blinks.
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Old 12-12-2009, 03:20 PM
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tell me if I'm right on this , the black plunger or choke you can see when you look up in the carb on the breather side controls the amount of air that enters the carb, so if I lift that plunger up with a screw driver and give it gas and runs good, then you would think that I'm not getting enough fuel, right, I mean if I was getting to much fuel then the plunger would stay up on its own, I 've checked the vaccume hoses and diaphram,spring, what does the diaphram on the side of carb control?
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Old 12-12-2009, 03:22 PM
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also, do you think I should just buy a new carb?
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Old 12-12-2009, 04:23 PM
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That black slide has a needle attached to it on the bottom. When you give it gas, vaccuum will cause that slide to raise up. As it raises up, it lets more fuel come through your main jet. The diaphram on the side regulates how that slide will raise.

Take a look at this vid that shows a GY6 carb in action:

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Old 12-12-2009, 05:10 PM
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so if the diaphram on the side is not functioning right the diaphram in the top of carb will not work properly
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Old 12-12-2009, 05:18 PM
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Its sad to say but I'm on dial up so it's take for ever to watch video's but from what I've seen , my buggies black needle plunger is not raising like the one in the video, what would cause that? mine only move a little bit on full throttle
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Old 12-12-2009, 07:38 PM
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so do you think the diaphram on the side is not working right?
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Old 12-12-2009, 08:13 PM
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When mine was not working correctly, the effect was that it would only rev so high. Like you could floor it and it would only get to half of its rpm at best. Personally, I don't think this is your problem but I can't say for sure. When I had a problem with that on mine, I actually stuck my finger in the end of the carb and assisted that slide to see what my probem is. If you decide to do that, do so at your own risk. A backfire through the carb could hurt.
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Old 12-12-2009, 08:51 PM
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I already did assist the carb but I don't know what is causing that, sounds like we had the same problem, what was the cause of yours not getting full rev?
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Old 12-12-2009, 09:02 PM
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If I assist the slide I can get full throttle or rev and it run great but if I don't assisit it I can't even get half throttle, the only thing I can think of is the diaphram on the side.
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Old 12-13-2009, 02:13 AM
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maybe the diaphram however, not likely just from sitting. Would take some outside help to be bad generally speaking. Check your vaccuum lines REAL good and be sure there are no kinks in the line.
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Old 12-13-2009, 06:34 AM
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there are only two vaccuum lines that go to carb, they are fine , is that what was wrong with your, kinked vaccuum lines?
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Old 12-13-2009, 11:13 AM
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after inspecting the the diaphram on the side of carb I noticed rubber missing on both sides which would explain lack of vaccum to needle slide, I guess Its probably time for new carb, any Ideas on the price of one and where I should get one?
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Old 12-13-2009, 12:25 PM
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For mine, the reason it had a problem was there is a little retainer ring that the line goes through that is attached to the screws that holds the top of the carburetor on. Because of the angle that the hose was at going through there and attaching to the tip that the line goes on, it had actually pinched the line to where not enough vaccuum could do the job. The cure was simply to take it out of that ring.

BigE or ****Mike should be able to hook you up on a new carb. Note that though carbs can come with different size jets in it. I've got one that came with a 114 and another that came with a 105. If you get a new carb, make sure the jets in it are the same as yours sizewise and if not, move the ones from yours over to the new carb.
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Old 12-13-2009, 03:15 PM
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is there a way that you could have put the diphram in upsidedown?just a thought i havent inside one like that.or does it have a small hole in it?if you could find one it should be cheep.
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Old 12-13-2009, 03:22 PM
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if you need a gasket make one out of a cereal box.it works good i put one on my truck 3 years ago and never had a problem.trace out what you need and cut it out,do a good job and you will have good luck with it.
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  #91  
Old 12-13-2009, 07:18 PM
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is the carb in the video a stock 24mm carb because my needle slide will not go up as high as that one does not even if I assist it, if I take the top off of the carb remove the spring, in the center , there is a needle hold down with a handle on top, the handle on top hits the top before it can fully open, is this suppose to happen or is something wrong?
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Old 12-13-2009, 07:35 PM
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That is a stock carb. Sounds like something is going on with that slide. It should move freely all the way up and back down.
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Old 12-24-2009, 07:36 PM
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what size jets come in a gy6 carb, and what size jets would you think I would need for indiana climate, I just bought a new carb and was checking the jets in it and they were smaller than the ones that came out of the old carb, there were no numbers on the jets that came on the new one but I did find the number 135 on the main jet out of old carb so I just switch them out. I assume this is the right move?
  #94  
Old 12-24-2009, 07:40 PM
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typically that is ok. Bige may be able to comment better but I am thinking a 135 is big for an otherwise stock machine and actually, that may have been what your problem was.

As to the jet that came in the new carb, it should have had a number somewhere on it. Some are on the face of the jet, some on the side. I've seen a wide range of jet sizes in new carbs.
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Old 12-24-2009, 07:46 PM
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I looked them over and there is not a number anywhere, but I could tell a difference in size, the new carb jets looked smaller I'll just install it and if it doesn't run I'll switch them out
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Old 12-25-2009, 05:07 AM
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a 135 is way to big for a stock motor. the strock jet could be any where from a 105 to a 110.
  #97  
Old 12-26-2009, 12:06 AM
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If you are running the stock exhaust not moded and the stock airbox leave the jet which come with the new carb in.If you were to open the exhaust up along with a UNI filter than you would need a 123-125 jet. The 135 jet if run long enough will wash out your rings. TOM
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Old 12-27-2009, 09:12 AM
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Hey Tom, The hammerhead lives, It seems to be running fine, but will that big of jet really hurt the rings, everything on it is stock except for that jet and its the one that was in the old carb, you can check the buggy running on youtube, just search under Parker City Hammerhead , there are five clips, and let me know if it looks like its running the way it should. By the way thanks to everyone thats helped along this journey.
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Old 12-27-2009, 09:35 AM
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If you are running too rich all the fuel will not burn and than the left over fuel will wash the cylinder walls down causing the rings and cylinder to prematurely wear. I would check to see if your running rich. To do this find a long flat surface 1000ft or more, the longer the better. Bring your plug wrench with. Accelerate to full throttle never letting up, at the end of your run turn engine off but do not let off the throttle until engine quits. Immediatly pull your plug and read. It should be light to dark brown. If black you are too rich, which I believe you will be, and if not you probably have a vacume leak some where. TOM
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Old 12-27-2009, 10:43 AM
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so what your saying is that if the buggy is running well with the 135 jet then when I put the stock jets in there it will not run well because the reason its running well now is because it has a vaccume leak, if the jet is to big wouldn't I notice it while I was riding it?
 


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