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Originally Posted by drmrd
My brother and I have bought the same bike, 1993 Vulcan 750's. He bought his 2 months after me, and his bike had come with custom pipes, and mine with stock. We have tried to switch pipes, and when I get his pipes, my bike works fine, but when he gets the stock pipes, his bike won't even work.
We are both unsure about what the problem is and could definately use some help.
Thanks.
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Welcome. Not sure what you mean by won't even work, but if it runs badly with your stock pipes, then an air mod and jetting was probably done along with the aftermarket pipes.