SOURCE: how to or can i
first major restrictor is in the exhaust pipe. Take off all the securing nuts and bolts to remove the pipe. You will notice in the end of the pipe that fits to the cylinder head there will be a washer that reduces the bore of the pipe. You will need to grind away the weld that secures this washer, clean out all metal particles and refit pipe to bike. This will dramatically improve the performance. Hope this helps' Alex.
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