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View Full Version : yfz 450r stock exhaust



yamahadudeb24
08-05-2012, 08:30 PM
ok so i was wondering i had an ltr 450 before with a stock exhaust sparky removed with a cherry bomb and the lid off now im wondering im buying a new yfz 450r soon and was wondering if i can take the spark arrestor out get a efi box and take the lid off i was wondering if that would be safe all around for the quad since ill be making up for the air fuel ratio mixup with the s/a and the lid off???