Question about 2001 Yamaha YZ 426 F

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Hello, I have a 2002 Yzf426 which refuses to start(Bought as a non runner) the previous owner told me the bike was running he stopped for 30 mins and it would not start. As a precaution i have checked and rebuilt the top end with new gaskets, the complete top end has no signs of any damage and all the parts are in great condition,cam timing is correct. I suspect the carb whilst trying to start it, i pulled out the hot start(Engine still cold) and it fired for a brief moment, is there a part that fails in these carbs?

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  • robert stewart Mar 16, 2011

    Bike now running, turned out the pilot jet was clogged with dirt, removed all jets and blew out with compressed air 140psi, refitted and it started after a couple of kicks.
    I have now discovered there is also an art to starting these bikes, kick over with decompressor engaged for about five or six kicks,find top dead centre,take the kick start slightly past TDC,bring the kickstart back to full height, release the decompressor and kick over (No throttle).



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I am speaking from my Yamaha XS1100, with 4 carburetors.It is a 1980 model, but the carburetors are always gunking up, especially if it sits over winter with gasoline in the tank. This also happens more frequently with the alcohol laced fuel that you have to buy now days. The alcohol causes it to absorb water that mixes with the gasoline and alcohol to form a sticky gunk that blocks up the orifices in the carburetors. The first thing that you can try is to get some Seafoam additive, or maybe Textron. Pour out all of the gasoline in your tank and change the inline filters if possible. Fill the tank with fresh gasoline and add the Seafoam in a generous amount. Allow the bike to sit over night and try to start it. You may get lucky and get the bike to fire up. If it runs rough and doesn't smooth out, you may have to clean your carburetor. See:

For a breakdown of your carb.

Posted on Mar 14, 2011

  • robert stewart Mar 18, 2011

    Now running turned out to be a blocked pilot jet, cheers for the info.

  • Norman Worley Mar 18, 2011

    I understand, I have 4 of the pilot jets that I have to clean out.



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How do you temporarily resolve the problem Pete?
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Does it still crank the engine over with the electric start while in the 'failed' state after the 30 min run, just not fire the engine?
Are you doing the spark test with the electric start or kick start?

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