Yamaha valve adjustment

get a colortune tool.it shows how your firing.read instructions that come with,so simple to tune carb in with.sounds like pilot out of adjustment.could also have a leak in ur carb boot or head.take a torch without lighting open valve with motor running run torch around gaskets and front of carb boot listen for change in motor.if it gets higher rev uve found a leak.

Correct--Not adjustable. Replace the float needle valve with a new one--Yamaha OEM only. If the seat in the carb is dirty or rough, Clean with a Q tip & a little polishing compound like Comet.

check youtube for generic valve adjusting procedures, the kodiak is like most of them.

Here's the info you're looking for.

1992-1998 Yamaha Timberwolf 2WD and 4WD
Intake: 0.05 - 0.09 mm (0.002 ~ 0.004 in)
Exhaust: 0.11 - 0.15 mm (0.004 ~ 0.006 in)

.004 intake
.005 ext

Valve lash. you may just need your valves adjusted.

bluetraxx.com might have a service manual posted with that info. yamaha also has owners manuals free for download but not sure if they'd cover that.

turn engine slowly until intake or exhaust valve is completely closed. gauge the opening on the other at .004 thousands. then close other valve and repeat process.

STOP TRYING TO START THIS ATV!!!

..Sounds like the valves are hitting the piston!!

Did you/your mechanic check the valve to piston clearance at max valve lift/PISTON HEIGHT??..you need at least .035" (.89mm) on the intake and .060" (1.5mm) on the exhaust.- MINIMUM - . THIS IS CRITICAL!!!

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.....11:1 is a pretty tall compression ratio. Are you racing this atv?.. one thing you will find out is that you NEED TO RUN HI-OCTANE fuel..NOT airplane fuel either (its got antifreeze and other additives you so not want to deal with)..11:1 might require a 110 OCTANE race gas to get it to run right... make SURE the timing is RIGHT!!..with this much compression the right fuel, timing, valve clearance, cam timing, etc, MUST be perfect!!!

check the compression?