Question about 2004 Yamaha YZ 450 F

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Yz450 f stalls when you hit gas hard

If i give it gas smoth it runs good but if i gve it all iot stals not good in a race it all so backfires

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It sounds like your main jet needs to be rejetted and tuned in it is sending to much gas and stalling out the bike

Posted on May 27, 2009

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Boyesen makes a product called quick shot 2 that will fix your problem i have a 07 yz450f and that made a big difference no more hesitation and bogging thumpin hard

Posted on Jul 15, 2009

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Along with rejetting the carb you also need to adjust you air screw brass flat head screw strart a 3 quarters of a turn out and go from there a quater turn left rev and ride and repeat till you find your sweet spot to start turn all the right (in) gentaly not to damage then turn left 3/4 turn try and then a 1/4 turn at a time you might want change your plug first to eliminate the problem

Posted on Jun 24, 2009

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