2004 Kawasaki Bayou 250 timing troubles

[atvsarenotmyprofession]

I have recently replaced my valves, piston rings, timing chain , timing chain guides, and the guard in the crankcase for the chain and its jumping one tooth at a time until its out of time and is attempting to bend the new valves... any help will be really grateful.

[Mech]

That's a strange one !

What sort of chain adjuster does it have, a manual adjustment or an automatic one ? Is it in good order ? If it's an automatic sort, is the ratchet in good condition..

Does it do it when it's running or as you rotate the motor by hand ? Is it perhaps trying to jump when the motor either backfires or as it comes up against compression as the motor's coming to a stop ? Some cam chain tensioners don't like the engine being turned backwards, or backfiring. The tensioners are only designed to take the slack out of the chain on the loose side, and don't always handle the load of being on the tight side if the motor's being turned backwards or backfiring.

Are the sprockets in good condition ?

Does the top and bottom sprocket look to be in line if viewed from above.. could the chain be trying to creep sideways and come off the sprocket ?

Is the chain the right pitch for the sprockets ? Do the links sit nicely on every tooth they contact ?

Are the cam bearings good ?

 

 

Edited December 29, 2021 by Mech

[thrasher7811]

I agree.  Sounds like the tensioner is not set properly.