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08-08-2013, 07:14 PM | #1 |
Join Date: Aug 2013
Posts: 2
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new top end, very low compression?
Hey there,
So I recently put a new piston, rings, cylinder, head, valves, springs, gaskets, etc., in a GY6 139QMB. I don't have any compression and can't seem to figure out why. I'm sitting at 35psi..???!! Leak down test showed no problems. please help? |
08-08-2013, 07:28 PM | #2 |
Join Date: Mar 2013
Location: illinois
Posts: 65
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I'd double check the cam timing with tensioner on, then valve adjustment, then a squirt or twl of oil, see what that does.
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08-09-2013, 05:56 PM | #4 |
Join Date: Mar 2011
Posts: 29
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if the head is not a performance head. and its just stock more then likely the valves leak. you have to lap them....
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08-10-2013, 01:33 AM | #5 |
Join Date: Sep 2011
Location: staunton va
Posts: 319
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Have you check your crank seals if the leak down test showed no leaks i would think it would have to be the rings are you gapping them right and placing them in the right order also when do the test for psi are you holding the throttle open
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2010 Cpi Oliver 70cc, naruku trans kit, downhill handle bars, tecnigas rsll pipe, s6 4g rollers, Vento R4 with 90cc 1e52qmf technigas next r 100cc pipe Naruku, 21mm race carb, s6 4.5 g rollers |
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