SOURCE: i was riding my wr 250cc
Check the sprockets. Got a stick or rock binding the chain? Remove the chain. Does the wheel spin freely? Brake frozen?
Since your bike is water cooled, a seized piston is not too likely. Got water in the radiator? Most likely is a broken torsion spring on the kick start shaft. The adjacent ratchet wheel and the kick shaft should be inspected. The ratchet wheel should have a smooth movement. If not then replace it. The kick shaft should not show wear or damage. The same is true for the kick gear and idler gear. Replace as needed.
The only other possibilities are a frozen main bearing, (not likely), a broken or severely bent shift fork, (more likely than a main bearing).
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SOURCE: Hard to start when cold, low compression in kick starter
you might of burnt your pistons ring out and now they are not pressing against the edge of the cylinder
SOURCE: i put a new piston and gasket kit on my cr 125
Honda 4 stroke, correct? It sounds like you have the valve timing off. Put a compression gauge on it and if you have 0 compression ,you shou;d reck your valve timing. Good Luck
SOURCE: started bike a month ago
make sure you are getting spark at the plug,
and check to make sure you are getting fuel to the carburator ( when in doubt - drop the bowl from the carb and check the float and seat for proper movement and fuel flow ).
next thing to check id to make sure the kill switch is working properly.
if you are still having troubles - please feel free to write me back here and I will do my best to walk you thru the steps needed to fix.
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