Jun 8, 2010
2
0
I have a 1999 YZ-125. Got in a trade a couple years ago. Blew the lower rod bearing. Put new crank, main bearings, seals, gaskets, rod, piston, ring, etc... Ran perfect for a month or so. Sat for a weekend, suddenly won't run for more than a second (literally), then seems to flood. I take the plug out dry it off throw it back in and get the same thing, a second of fire and dies.

Fuel is good (running 32:1), compression is good (150-160), spark is good, float not sticking, carbs clean, jets clean, intake's clean, reed valves good.... :bang:

Any advice appreciated.
 

Uchytil

LIFETIME SPONSOR
Jun 29, 2003
814
9
Sure sounds like a carb issue. Needle valve? Need to change them every so often. I'd go back through the carb.
 

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