I did my first valve adjustment on my 2005 CRF250X. It fired up fine when cold but had trouble starting when hot hence I checked valve clearance both intake valves were out of spec. The exhaust side was fine. Below are the details.
Clearance measured: L 0.05mm and R 0.05mm (Spec 0.12mm)
Old shims: L 1.56mm and R 1.55mm
Used the handy shim calculator from this website and ordered new shims both 1.475mm
Installed the shim and replaced everything. Never moved the piston from TDC when doing the job and made sure when re-installing the camshaft that the 2 marks lined up the with top of the header. Also marked chain and sprocket to make sure the chain was going back in the same position. Re-installed cam chain tensioner (completely removed it) and torqued everything to spec.Remeasured clearance and all valves are within spec.
Now the bike barely wants to start and it backfired once. I did not remove carb or exhaust header and neither did I remove the exhaust rocker arm. I am stumped. Any suggestions on what I might have missed?
Thanks,
Bart