My yamaha 350 warrior, and it wont start, Do i need to adjust the valve? How do i do that?

if spark and good compression ..just leaves fuel

will it start with fuel down the carb ?
not flooding
jets adjusted correctly

would say the old carby has had it.. worn out

needs a new one

hi .. go straight to here .. youtube link. http://www.youtube.com/results?search_query=yamaha+350+warrior+stator+test
yamaha 350 warrior stator test YouTube

Replace the idle jet (don't clean) with a new one from a Yamaha OEM only $5.00 & make sure the idle mixture adjustment on the bottom of the carb. is set 3 1/2 turns out from seated in (a brass screw ---Don't over tighten & break off the needle tip). Also , be sure the choke is all the way off or it won't idle either.

clogged choke jet or passage for sure.

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

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

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.

Try checking the switch for your parking brake. It is the top wire in the clutch handle boot. This wire connects to your CDI box, and restricts the RPM's while the parking brake is engauged. To find out for sure, trace the wire down to the plug under the headlight assembly and disconnect it. Now try starting you machine and give it some throttle!

hello
with the cylinder set at top dead center compression. using a feeler gauge between the tappets and the valves there should be .002-.003in clearance on the intake valves, and .006-.007in. clearance on the exhaust valves. thank you.