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Post by hellomodo22 on Oct 5, 2013 3:10:51 GMT -6
Hi i have a jinlun 125t-10 (tommy) and was riding when it just cut out and wouldnt start again. It seems to be turning over pretty quick and i have spark but no compression. Can anybody help as to see whats wrong.
Thanks
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Post by gatekeeper on Oct 5, 2013 3:59:44 GMT -6
Usually when you lose compression all of the sudden it is a valve stuck open or a blown head gasket. Could also be bad rings but I would check out the valves first.
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Post by jct842 on Oct 5, 2013 10:11:36 GMT -6
2x on checking valves.
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Post by scooterbob on Oct 5, 2013 21:38:31 GMT -6
Loose spark plug?
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Post by jct842 on Oct 5, 2013 21:52:48 GMT -6
the plug is where you check compression,.......he said it had no compression and you check it with the plug out/ |
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Post by hellomodo22 on Oct 6, 2013 3:38:38 GMT -6
Hi thanks for your replies. Not really mechanic minded lol but il try my best. Lost without bein able to use it.
Took this picture yesterday and bottom valve is quite loost and top is tight n dont move at all.
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Post by hellomodo22 on Oct 6, 2013 3:41:38 GMT -6
Sorry picture size to large so will try upload one asap
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Post by jct842 on Oct 6, 2013 7:21:10 GMT -6
Time to get a wrench and the feeler gauges out and set valve clearances.
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Post by scooterbob on Oct 6, 2013 22:47:25 GMT -6
jct842 He mention the engine turning over as if it had no compression. You can check spark with out removing the plug so surmised he had not check it. You never know.
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Post by Alleyoop on Oct 6, 2013 23:06:44 GMT -6
Make sure that you bring it up to TOP DEAD CENTER before adjusting the valves. The way you just described it, it was NOT at TOP DEAD CENTER. What you described bottom valve loose and top tight, the top valve is the INTAKE VALVE so that was pressed open and it is on the INTAKE STROKE to suck in fuel and air. Turn the motor over by hand using a wrench on the FLYWHEEL or VARIATOR and get the CAM SPROCKET lined up like this: THEN ADJUST BOTH VALVES to .004 inchs. Alleyoop  |
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Post by shop242 on Oct 9, 2013 17:19:11 GMT -6
Timing Chain may have jumped a notch or two.. Do ya have a lotta miles on it?
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Post by shop242 on Oct 9, 2013 17:26:30 GMT -6
And also.. Those chinese TDC marks are not accurate. I took my cylinder head off and found absolute TDC and adjusted my cam as alley prescribed.. Made my own timing marks on the flywheel after finding ( The Real TDC ) To get the Cam marks right as Alley showed ya . Make sure you dont have a broke tensioner
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..BAD TO THE BONE..