Yerf dog spider box running REALLY rich
 

Brand new carb...oil had the viscosity of water due to gasoline inside the oil...changed oil. The kart still runs lean. Runs kinda rough, smokes A LOT of white smoke. Was fine before sitting for awhile. NEED HELP!

Thnx

let warm up and run for awhile and see if the white smoke goes away. you may have water sitting in your muffler. if the smoke doesn't smell like oil, that's the likely issue. if you're getting oil into the combustion chamber, it'd be more gray tinged and you'd be able to smell it. If it has no real odor, you'll need to run it until it all evaporates out or take the muffler off and drain it.

It's been run for probably a good 1/2 hour and the smoking is on/off. If I restrict the fuel flow it stops smoking then dies. Once shut off, the tail pipe is smoking and the carb is gurgling and smoking as well. Unburnt fuel is entering the exhaust somehow...thanks for the reply. Any more input?

Thanks!

If you have a vacuum operated petcock it may be leaking fuel into the vacuum line.

It's a 2007 Yerfdog Spiderbox. As far as I know it is not a vacuum operated petcock.

Does your petcock have an on/off lever and 1 fuel line going to it? Or does it have 2 lines going to it and no lever?

I cannot locate any petcock, for that matter. See pics below.

[IMG]http://i1151.photobucket.com/albums/...psb35c1172.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...ps2022eb02.jpg[/IMG]

The petcock is where the fuel comes out of your tank. If there is 1 fuel line and 1 vacuum line going to the fuel tank then you likely have a vacuum operated petcock.

If the vacuum operated petcock is bad it can feed fuel into your vacuum line and make the buggy run rich.

Do a google image search for ''gy6 vacuum operated petcock''

There is only one line going from the tank to the carb. If there is a petcock, I cannot find it. Ill keep looking.

I cannot find any petcock. It's just the gas line from the tank to the fuel shutoff with to the filter to the carb.

If that's the case then it sounds like your float level or float valve[I call it needle and seat] need attention.

I would pull the bowl off and see if the fuel stops flowing once the floats are lifted. If it stops then you might just need to adjust the float level. If it doesn't stop then your needle and seat might not be sealing off the fuel.

But the carb is brand new! Maybe it was put together incorrectly...thats all thats been touched recently and it had zero issues before sitting for 5 months.

Did you clean out the gas tank before putting on the new carb? 5 months is a long time when it comes to gas with ethanol in it.

If you ran old crusty gas through a new carb you may just have a piece of gunk stuck in the needle and seat/float valve

Thnx or the info. The gas tank was empty. Something else to add, when turned on after sitting for, say, a day or so, it will not smoke. Maybe after 2 minutes of idling it starts smoking and gradually gets worse. Also whenever I remove the oil cap, a lot of air hisses out like under pressure when engine is off....

I REALLY appreciate the help!

I will check the needle and seat.

Well that sounds like a whole other issue. Excessive crankcase pressure usually means a clogged crankcase vent. Are you sure you have all the hose in the right places?

Would you happen to have a hose diagram for an 07 spider box? :)

Like I said, I wasn't the one to assemble it so IDK until I see a diagram.

THANK you.

I don't but in most cases the crankcase vent tube will go from the crankcase to the airbox.

Ok. If you happen to know where I can locate a hose diagram that would be helpful. To be honest, I don't know much about these engines. I'm use to the 97cc briggs, not the Howit. I will do my best to find fault in the hoses.

#1 Never assume the previous owner did anything correctly. You should verify the jetting in the carb, even if it is new. A lot of these carbs come from China. And they're not all jetted the same.

#2 what air cleaner are you running?

#3 please take pics of the hose routing going to the carb. I'm really interested in where the hose with the "T" is going.

#4 Check the hose coming off the valve cover for obstructions (crank case vent)

#5 Wouldn't be a bad idea to check the valves for adjustment while you're inspecting the vent hose in the valve cover.

There are good videos on U tube showing how to check/adjust your valves for the gy6 150.

This should help a bit too. http://www.familygokarts.com/manuals...ice_manual.pdf

I will get you pics tomorrow of the routing. I removed the air filter..is that what you mean by "air cleaner"?

Thnx for the input

Nobody has time for tomorrow, here are the pics. See anything unusual?

[IMG]http://i1151.photobucket.com/albums/...ps15273cef.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...ps048d2a1b.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...psa9685446.jpg[/IMG]

The T-hose has one side going to the bottom of the carb and the other side goes nowhere. Also have another hose that is not connected to anything I think its a drain hose of some sort but I'm not sure.

Found the vacuum valve (petcock?) no lever or settings etc.

Removing the air cleaner can mess with your jetting. Not to mention it's terrible for your carb and engine.

Hmmm...this is a surprising development. I thought it didn't really make a difference...well, I'll slap it on and see what happens, though, I'm sure something as severe as this is not caused by the air filter.

Thanks for the input AND your valuable time!

It wouldn't cause the crankcase to fill up with gas but it can definitely make the buggy sputter and fart.

I tried to fill the engine with oil (still is too low) but air bubbles would push about 80% of the oil right back out...so filling was in vain...see any faults with the hose routing?

Every time you post you have a new problem. Is this for real?

All of this has been happening already, no issues are new. I just remember them between post. :) It sounds to me like hose routing is at fault but I have no way of knowing which hose goes where...thnx

If you have oil shooting out of your engine then you have either over filled it or you have serious blow by.

It was only doing that because there was gas getting into the motor and filling with the oil. Now that I changed the oil it doesn't shoot out, it just has pressure inside the motor.

Yes, air filter/air cleaner. What are you using? The stock box, or an aftermarket UNI/K&N style?

That hose coming off the "T" concerns me. Bottom of the carb???? This may be a a HUGE problem. Might be why you're getting gas in your oil.

That is your vacuum hose going from the intake manifold to the vacuum fitting on the CV carb.

If you have air inside the crank case, check that hose coming off the valve cover.

I need a pic of your "vacuum valve". Yerfs didn't have one from the factory. They didn't eve have a petcock. Yours was added by the P.O. in line. (red lever valve just above the filter)

Thnx for the help. It's an aftermarket (I think) K&N style air filter. I tried running it, ran kinda crappy but never died or smoked. (didn't run it for more than a minute) I went to open the oil cap and oil spurts out as soon as I loosen the cap and oil dribbles out and squirts.

The hose with the T...my mistake it goes to the intake...see pictures.Thought it went to the carb for some reason...

Here are more pictures and a pic of the serf so you know what it looks like. :)

[IMG]http://i1151.photobucket.com/albums/...ps7446cbca.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...ps6baabeec.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...psb72bee5a.jpg[/IMG]

[IMG]http://i1151.photobucket.com/albums/...ps64e2fea3.jpg[/IMG]

sounds like you have a few separate issues that are compounding into a real mess.
firstly that new carb .. it's most likely the jetting is incorrect, hence the smoke and rough running. The aftermarket carbs are intended for scooters and are not setup correctly for buggy's. If you have the original carb, your in luck. take the jets, main and pilot and install in the new. If not buy a 115 main and a 35 pilot jet. that will fix the carb.
The hose routing is questionable... like "x" noticed. that T in the vacuum line is wrong. There should be ONE hose only running from a nipple on the side of the intake to the top of the carb.
There should be a hose connected to the drivers side top corner of the valve cover. It is open to air. It is a vent breather. it should not be connected to anything. make sure it is free flowing. IF so that's where that extreme crankcase pressure is coming from.
The hose on the bottom of the carb is just a bowl drain hose. it can be removed completely if you wish.
fuel line runs from tank through a inline filter to a nipple on the drivers side of carb. No vacuum petcocks were used on the yerfs

OK, now we're getting somewhere.

Remove that "T" and run a hose from the intake manifold to that fitting on the top of the carb in that third pic.

Ckau has given you some solid help.

Check/replace those jets

Fix that vacuum hose from the intake to carb

Check that valve cover vent hose

Yup on mine I have a hose going from manifold to the top passenger side of carb. (Diaphragm). The hose on the valve cover just hangs down low. Pull the hose off the valve cover and see if you can blow thru it. It may be clogged. It needs to breath.

If you have a hose running into your air filter pull it out. You don't need that. I don't have one.you should have one hose from your gas tank going to a gas filter than to your driver side of carb.that should be it.

Thanks for the help! I will try some of these and report back.

may help
 

if no help now, maybe in the future.

^^That picture is very helpful...thanks! I haven't yet gotten to it since last week, but I will eventually. I'll post the results.

White smoke out the exhaust on an air cooled engine is oil. When the oil gets diluted with gas it only takes minutes of driving to wipe out the rings, piston, cam ect. The pressure in the crank is either from blow by or the crank case vent is blocked or plugged. As CKAU stated make sure the hose from cover is not blocked, it should just hang freely.

Can anyone update this thread? I am having the same problems with my yerfdog and worse. I am having fuel blowing out of the valve cover at acceleration. The cart set for about a weeks while I waited for a part. The fuel is oily.

Sounds like your getting fuel in oil. If so do not start or run. Drain oil if contaminated with fuel. Problem could be stuck float or bad vacum fuel pump if equipped