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01 yz426
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Posted by: snake keeper---------------------

Ok here goes, I am trying to jet my yz426 correctly, I have added a spark arrestor with a silent insert that brings the db level down to 96 or so. Do I add more air or less air with the restrictive insert in place. I checked the plug and the insulator was white{lean} I then lowered the clip on the needle one notch. I rode the bike for about an hour and checked it again. The insulator was 1/2 white and 1/2 black.The air screw is currently one turn out. Any suggestions??
thanks

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01 yz426

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