CB450 2 into 1 Exhaust

Motorcycle Exhaust

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Nighthawk 450 with Mac exhaust
new Mac 2-1 Exhaust with baffle. They say a rejet is not needed, but I have changed the needle height and am going to change the mains. Before raising the needle it would stall at 4500 rpm then surge. I put 2 #4 washers from radio shack under each needle. With that set up its running a bit rich so I might try just 1 washer under each needle.

CB450 E escape 2x1
cbzona 1984 com escape artesanal 2x1... aqui outro video da moto.. http://www.youtube.com/watch?v=I9sM-jx33bg&feature=channel