2003 kfx 50
Well my son's 2003 KFX 50 just quit on us, when i tried to start it back up if sputtered and died and now wont restart, i have good spark from the plug and the carb is not clogged, but i don`t seem to be getting any fuel to the combustion chamber (plug stays dry), if i pour fuel into the combustion chamber it will sputter but never actually start and again when i pull the plug back out it is dry. if i pull the carb off and plug the intake with my finger should i be feeling any kind of suction because i'm not getting anything?
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I'd do a compression test. Might be time to freshen the top end.
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Yeah...if no "pull" from the motor at intake then sounds like compression issue...you can also put your thumb over the plug hole...it should pop off when cranked...
if not definitely compression issue... |
Compression checked
OK so I am sitting in my garage and I just checked the compression and it's at 80 psi ..... I know it's low but shouldn't the atv still try to start if I put fuel directly in the cylinder ? And with a bit of oil in the cylinder I get about 90 psi ......
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It generally takes 90+ to fire...it's low and needs a refresh...
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ditto
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Update
Well got the cylinder bored out .... it was already first o/s so got it opened up to second o/s , new piston , rings and seals and compression still at 80 psi 😢. Any suggestions on what could be causing my issue ? Thanks again for the help guys !
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Check the reed?
Maybe the rings need to seat. What brand of piston did you use? |
Used a wiseco piston ..... and I found my problem it was the crank seal on the flywheel side that was popped out. Thing runs like a charm now!
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awesome!
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