Question about 2002 Yamaha YZ 426 F
Sounds like you have timing off, reset timing chain crank at tdc cams at 9 & 3 o'clock marks on gear go along with head then after on release tentioner, then turn motor over with rachet to make sure its not hiting valves
Posted on Feb 04, 2010
Did u hav piston @tdc power stroke-valves shud slightly clic with ur hand after ajust-mite hav performed it at exhaust stroke! let me know
Posted on Jan 27, 2010
1) The cams were in the wrong position or wrong stroke when clearance was measured. or
2) The shim change was mis-calculated or shims mixed up resulting in zero clearance causing leaky valve and the backfire. or
3) The cams were installed out-of-time after everything was installed including the cam chain tensioner. Note: if a valve was hitting the piston while kickstarting, it will be bent and will have to be replaced.
Posted on Feb 16, 2010
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