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2001 yamaha warrior YFM350x won't fire up

Chase Cook

By Chase Cook
in Yamaha ATV Forum

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Chase Cook Enthusiast

Chase Cook

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I have a Yamaha 350 in at once to try to fire up but won't. It's getting gas fire air and it has a lot of compression but still struggles to start check the timing it's top dead center valves are good valves are adjusted everything's working but won't fire I put my hand over the carb suck in gas and it tries to but it makes a lot of black smoke. Also when I put my hand over do you carb and tried to start it there's black black nasty stuff in the gas. So I don't know if it's trying to burn too much or what it is the gas tank clean and it anything to do with the gas it's with it firing. Took the spark plug out and it's pure black. What is dried up black not nasty corroded wet looking. Need help to solve the issue

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Frank Angerano Grand Master

Frank Angerano

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Welcome to Quadcrazy @Chase Cook  It sounds like a typical carburetor cleaning. Have you taken the carburetor off of the machine and broken it down to clean it ? 

Also have you looked into gas tank to make sure it’s clean and no rust and junk inside and the fuel valve is free flowing ? 

That would be my first move. Throw a fresh spark plug in as well and my guess is it will run fine.  

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JacobSlabach Mentor

JacobSlabach

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Yea start simple, smell gas in tank so make sure it's not diesel or have water in it.  Clean carb, black crap in gas sounds like gaskets in carb going bad or some other source of dry rotted rubber.

I'd replace gas lines and fuel filter, clean tank and carb with some carb cleaner, check carb gaskets, throw it back together with some fresh gas and fire it up!

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  • Ajmboy changed the title to 2001 yamaha warrior YFM350x won't fire up

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