2003 Yamaha YZ 250 Logo
Posted on Jul 26, 2009
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Quad keeps goin through spark plugs

Hi my yamaha blaster will run for few days then when i start it the following day it will go for 10min then stop i remove the spark plug it is black an sometimes wet even after cleaning it wont go it has to get a new one then it will go for few days again then repeats itself

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  • damien29 Jul 26, 2009

    hi what is the ratio i was told it 40:1 is that correct,thanks

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  • Posted on Sep 04, 2009
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Yamaha recommends a 32:1

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Or is the choke sticking on????

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  • Posted on Jul 29, 2009
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Run a mixture of 30:1 and adjust the air/fuel on the carb if needed.

Murtaza Akberali Versi

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  • Posted on Jul 26, 2009
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The engine is running 'rich' thus fouling the spark-plugs, you will have to set the air-mixture ratio.

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