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  #1  
Old 02-26-2010, 01:17 PM
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Default gy6 motor model # question?

I see on alot of gy6 part ads that say it will fit a 139qmb or a 157qmj ,what is this?I have a yerf with a howitt 150cc what one is mine.Anybody,Anybody.If anyone has an insight please let me know,thanks.
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Old 02-26-2010, 01:48 PM
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Yours should basically be the 157 the 139 is a smaller cc motor I believe a 110 or 125 I can't remember now. There should be an area of the block right under the cvt cover on the side of the motor not the bottom with some numbers etced in and this is the motor model #.
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Last edited by EJ Mac; 02-26-2010 at 01:52 PM.
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Old 02-26-2010, 09:06 PM
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should say 157 or151 for all parts to fit best i remember
external parts should bolt on any way
olderthan
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Old 02-26-2010, 10:03 PM
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The reason why i am asking is there are some parts on ebay coil,cdi and some say 139 and some say 157 which one do i get.I have a 100 bucks in ebay gift cards burning a hole in my pocket
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04 yerf 3206
rag top
uni filter
redneck intake
125 jet
16.5x6.5x8 fronts
21x11x10 holeshots on itp's
coming soon 10g roller 1500rpm spring
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  #5  
Old 02-27-2010, 12:54 AM
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157 is the 150cc
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Old 02-27-2010, 10:03 AM
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check on the side of the engine case passenger side
will be stamped there
olderthan
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2008 tomberline punisher
1500 spring 12g sliders
30mm cv pumper carb
uni filter no rev cdi
polaris xlt snowmobile shocks for front
w/550 magnum springs & blaster fronts on rear
and another buggy built working on mods gk-13
white spring 17 gram sliders so far
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Old 03-03-2010, 10:09 PM
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The howitt 150 on the spider box is a 157qmj
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Old 03-04-2010, 03:40 AM
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FYI. here's what the motor numbers mean. This will tell you what motor you have. Travis @ ********** got this info for us.

(Digit #1) Corresponds to the number of cylinders. All GY6 engines are single cylinder, so this number will always be 1.

(Digit #2 and #3) This is the bore size in metric millimeters, in the case of the 157QMJ, our bore is 57mm. Note that 57.4mm bore engines fall under the "57" designation.

(Digit #4) relates to the style of engine. All GY6 engines are designated "Q".

(Digit #5 and #6) The actual size of the engine. The second letter ascends consecutively for each 10cc. MB = 50cc, MC = 60cc, MD for a 70, MH = 110cc, MI = 125cc, MJ = 150cc
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Old 03-04-2010, 07:45 AM
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Ckau,I hereby appoint you as almighty buggy guru,you always have such great info.thanks to all who helped me.
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04 yerf 3206
rag top
uni filter
redneck intake
125 jet
16.5x6.5x8 fronts
21x11x10 holeshots on itp's
coming soon 10g roller 1500rpm spring
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  #10  
Old 03-04-2010, 01:00 PM
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Excellent info there Ckau
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Old 03-04-2010, 03:35 PM
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charlie has been around and has done more to these motors than before we all were alive
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  #12  
Old 03-04-2010, 07:46 PM
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Quote:
Originally Posted by EJ Mac View Post
Excellent info there Ckau
I don't take credit for this info. A long time buggy parts dealer who caters to yerfdogs did this research. I was just passing it on.
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