Shimming is used mainly when there is a lean condition at certain throttle positions (see the thread in this section). Basically it raises the needle slightly (richens) so more fuel flows at a given throttle position.

'05 TBA, Freak/152.5 mains/48 pilots/Gutted Shotguns/AI/Custom rear hangers-Chain Guard/Sport signals/Ness Mirrors/Kury pegs/Driver's Backrest/LOTS OF CHROME!