Question about Yamaha YZ 250 F Motorcycles

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I cant start my yz250f 05 4 stroke? it back fires and idoled for half a second now wont start at all?

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You need to check that the engine is getting spark and fuel. Remove a spark plug and wire, lay the plug on the engine so its grounded and crank, see if your getting the spark, it should be a bright purple/blueish/orange color. also check that the engine is indeed getting fuel. try supplementing the fuel with a spray of ether but watch the can and only sparay alittle. let me know what happens.

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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If you have a weak spark it will not start since under compression it takes a much stronger spark to jump the gap as compared to a spark in normal air pressure. Try a good known working coil.

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Torque specs 2011 yz250f


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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I have a 2007 yz250f and the kick starter locked up if i remove the spark plug boot i can kick the starter over then put boot back on plug then i can kick it over and it will start then die about 20...


Hi, Motoracer05 for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Aug 24, 2011 | 2007 Yamaha yZ 250

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Ok i just bought a 02 yz250f ran great for a while then started fouling plugh now it wont run at all ive done everything i can think of spark plug oil gas oil filter air filter etc still nothin it started...


Hi,
That's a 2 stroker, the problem with two stroke is usually air tightness.
There must be no air leaks from the engine block to the piston block. Check if there is a suspected air leak around the base of the piston block, engine block( carburetor inlet side ), and reed valve. You could see a leak if there is some 2T oil coming out from those areas.
Check also the reed valve that usually breaks down in two stroke engine, the flaps should seat tightly without any leaks.
Check all of that and tell me afterwards what happen.
Hope that helps you out.
Thanks for using FixYa!

Jul 07, 2011 | 2008 Yamaha yZ250F

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I just bought a second hand 05 Yz250f and it cranks on the first kick but will only idle if the choke is on. Back fires on accel and decel with the choke off. Took the carb apart twice and cleaned every...


carb still not clean. sounds like low speed, pilot or fuel screw still not 100% backfiring because it is too lean. wouldn't ride too much uncorrected as it will make engine run hot

Apr 19, 2011 | Yamaha YZ 250 F Motorcycles

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What type of oil is used for gearbox and how much does it hold


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Dec 24, 2010 | 2003 Yamaha YZ 250

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I have a Poulan Pro PP133 33cc 2 stroke weed eater. It starts but when you give it full throttle it dies. It will Idol but will not accelerate to full power, then it dies if you don't let off the trigger....


check spark arrester in muffller where exhaust comes out there is a screen either under a plate with 3 screws or a round tube that u can pull out with pliers somtimes they clogg with carbon and wont let exhaust out. enuogh at idle but backs up after that hope this helps

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My Yamaha yz250F 07 starts first kick but back


I see: you changed the plug because it was backfiring.

Does it back fire when you let OFF the throttle after revving it, or does it back fire while being revved?

If it does it when you let off then Ollie's suggeston might do it. If that doesn't do it then check for dirt in your pilot jet.

If it back fires when revved up high could be dirt in your main jet.

Oct 31, 2009 | 2004 Yamaha YZ 250 F

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