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Author Message   Schmitty Posted on Sunday, February 03, 2008 - 12:09 pm:        I am going to change the oil pump drive gear to the bronze gear on my XB9R race bike. While I'm at it I'm going to do a top end inspection. The bike has 5500 miles on it. I was thinking about dropping in a set of Wiseco forged piston and Wiseco rings in the standard bore. Is there any benefit to this with the standard bore? I don't have the cash to go big bore, but I'm adding the Micron full system, and having the bike dyno tuned. What is the standard compression ration for an XB9? The Wiseco catalog says 10:1 with their pistons and rings installed. They also claim the usual reduced friction and stronger, etc.. There is also a .010" over option. Is this for worn cylinders? Would 5500 miles have worn the cylinders that bad? Any help or knowledge is appreciated. Schmitty   Puddlepirate Posted on Tuesday, February 05, 2008 - 03:12 pm:        If you have 5,500 miles on a racebike, you probably should go ahead and get it bored to the next size. If you drop a new set of pistons/rings into an old bore, you may break your top piston ring.

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