CB450 2 into 1 Exhaust

Motorcycle Exhaust

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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.