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  1. M

    alot of backfireing

    hey guys i gota 98 blaster with a 40 over bore ..i think..fmf fatty gold series pipe fmf power core 2 silencer and took off my air box lid...it ran fine ive had it for about 3 years and i rebuilt the top end last summer..now its back fireing alot and on the cylinder head were it meets the block...