Question about 2005 Yamaha yZ 250 F

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Back fires after letting of the the gas

What too you all think it is

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Valve adjustment is need

Posted on Mar 30, 2014

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Engines troubleshooting

If this is a 2 cycle engine it has oil mixed with the gas. But if this is a 4 cycle you may have overfilled the crankcase.

When exhaust shoots through the carburetor it is either a valve stuck open or timing issue. A stuck valve lets the fuel mixture come back out the engine.

Sep 05, 2014 | Garden

1 Answer

It hasnt been started in a year. it gets fire i replaced the coil thinking it wasnt getting enough fire. i can smell gas so i guess it gets fuel. it turnes over and over but never hits a lick. took out...

well if its getting both it could be a number of things....there is a lil check valve on the fuel rail looks like were u put air in the tire...turn the truck over and stick a little screw driver in it fuel should shoot out....if it is getting fuel to it then replace your cranksensor...let me know how it goes...hope it helps

Mar 28, 2010 | 1996 Mazda Pickup

1 Answer

L have a 2001 suzuki vs800, it back fires every

sounds like you may have a blowing exhaust?...if so it needs sealing as it sucks air in when you shut off & cause's the back fire

Mar 09, 2010 | 1995 Suzuki VS 800 Intruder

1 Answer

Gas, spark but will not fire

obvious things first , are the leads on the corect plugs for firing order,are the plugs sparking , fuel in tank ,all other wire's connected , may have dislodged something when changing plug's etc, hope this helps

Jun 03, 2017 | 1995 Volkswagen Jetta

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