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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
bike won't start
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[QUOTE="nikki, post: 688295, member: 18126"] I'm guessing your friend had someone else do the work so I'm not sure how familiar he is with valve clearances and stuff... so here's a quick "how to" if it's the same problem that I had: Check valve clearances: Remove seat/tank/shrouds, spark plug cap, 2 bolts in valve cover, and valve cover. With piston at TDC (use TDC window/nut behind two caps on the case shifter side - its in the manual), measure valve cap to valve puller clearance on the 5 valves with a feeler guage (get an any auto parts store for a few $). The "in spec" clearances for exhaust and intake valves are different and listed in the manual. If he doesn't have a feeler guage and it is a shim out of the groove, push around the kickstarter to where the valve caps are flush and you'll see (or feel with your finger) one sitting higher than the others. If there is one that looks/measures higher then.... to put the shim back in the groove: With piston at TDC, use a paint marker or white out or something to mark where the cam chain lines up with the cam sprockets. Remove cam holders (a bunch of 8mm bolts - beware of the C-clip spacer don't drop it), and loosen cam chain tension through tensioner (need small screw driver), tie a wire or something around the cam chain so you don't drop it in the case, then remove cams. Use a magnet to lift the valve cap covers up and hope to find a shim not sitting in the groove. Put it in it's groove, put the cap back on, put the cams back in, line the chain back up, put the cam holders on, tighten the cam chain, put the valve cover back on and you're good to go. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
bike won't start
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