Aug 27, 2016
23
0
Hey guys I just picked up a 2003 yz 250f and it loose compression when kick starting it. It kickstart no problem when cold around 2 Kick when playing with the kick start getting the piston to compression stroke. But when warm it doesn't wanna kick over I can move the kick start down with my hand, it isn't firm like a 250 should be. I'm mechanically incline with cars but this is my first bike. the guy I bought it off of told me he redid the valve so I'm thinking he messed the clearance up
 
Aug 27, 2016
23
0
Forgot to mention bike run great when it warm I just bum start it. Kinda stuck tho I would love to have a bike kickstart anytime and anyplace no problem. I'm doing a full rebuilt on the bike this winter but I wanna ride it before it the season ends
 

Rich Rohrich

Moderator / BioHazard
LIFETIME SPONSOR
Jul 27, 1999
22,838
16,902
Chicago
Checking the valve clearance is very easy on these engines and is the logical place to start given what you have described.
 
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