98 YAMAHA WARRIOR 350 WONT START

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

If you have good spark then it's most likely a fuel issue, anything off of idle is dealing with the main jet and metering needle, clean jet and check needle for excessive wear.

Is it a fat blue spark, Is it good fuel, have you done any recent work that might have cause this problem. If you have a small bottle that you can put a little bit of fuel into. Remove the spark plug put the fuel into the spark plug hole. install the plug back into the hole, make sure not to spill any fuel , if so clean a dry the fuel. Try to start, if it fires and runs for a bit it is a fuel issue. Just because you have fuel to the carb doesn't mean there aren't problems with the carb. There should be a drain screw on the bottom of the float bowl. remove it , is the clean fuel coming out. this is a good place to start.

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.

Drain out old fuel.put in fresh fuel. Take out spark plug put in little gas and put spark plug back in. try to start.

Clean the cab, the pilot jet is not allowing enough fuel through so when you turn the choke off there is too much air and not enough fuel in the fuel mixture causing it to die.

remove all of the old fuel using a siphon bulb and hose. Put in brand new fuel and make sure the line from the tank to the carb. is flowing gas. if not clean or replace the fuel line

You should do a carb clean. os it sounds like some of the jet and or passsages are blocked. The carb should be removed from the bike and completely disassembled and dipped in carb cleaner. What I think works best for cleaning carb is Yamaha's Carb Dip I mix it 50/50 with warm water. All the rubber parts must be removed as they will be swell and be damaged by the dip. After you dip the carb it will need the all passages verified with spray carb clean to make sure the fluid will make it through the intended passage.

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!