2001 yamaha warrior valve adjustment

sounds like it could by the timing chain / chain tensioner
or you need to set the valve clearances if its tappy rather than rattly

check the compression i work at btn powersports if you dont have enough compression it will not start if that dont work check the timing and if that dosent work, the valves might need to be adjusted or replaced. steve.

had the same thing on my 350 the adjustment screw for the valves had backed out had to readjust them and replace lock nuts

it is a simple fix. you can get the specs from your local dealers parts person. and the valves are under two caps on the top of the jug. the caps have two small allen screws holding them on. just remove the caps, you will see the top of the valves, there is a small jam nut with the top of the adjuster sticking out. it has a small slot in it. loosen the jam nut, then check the clearance with feeler gauge. turn the center of the adjuster with the slot in it with a small flat screw driver to adjust the clearance. then tighten the jam nut. if you have any experience working on engines this will be a simple thing for you to do.

have u had it serviced its suppost to have the valves and cam chain adjusted that tapping is probally one of those items seeing how it runs good and u have no other problem but you need to have your valves adjusted soon

It sounds like it might be flooding or the timing might be out of wack. iw ould start by letting it sit for 30 minutes and try restarting the bike,.If it starts and then dies again have the throttle leaned a bit. If that is not the issue have the timing adjusted

adjustment of valve reasonably simple, remove tappet covers, remove small bung from mag cover top and rotate engine until you are able to see a capital T on the flywheel, providing whist you rotated engine it was on the correct stroke the inlet valve should have just closed when you saw the T. this is the correct stroke. loosen tappets lock nuts, adjust the tappets so you can just move it with your fingers, if your want to get technical the clearances between tappet and valve should be about .05mm

first you need to remove everything that covers your valve covers(gas tank etc.) remove the intake valve cover,and the rotor nut and timing plug.set the engine a t.d.c.(top dead center)fit a socket onto the rotor nut and turn it counterclockwise until the"I" mark appears align it with the index mark in the timing hole.use a flat feeler gauge between the top of the valve and the adjuster.loosen the locknut and turn the adjuster just until you feel resistance on the feeler guage.hold the adjuster and tighten the lock nut down.i can not tell you the min.clearance spec to your quad since i have a 660 raptor.try using the smallest clearance number.