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RE: horsepower increase
Daniel said 2007-01-17 20:40
You can bore it, Mine had to be bored because the inside of the pistons and such were cracked from bad manufactoring, not all yamaha´s are like this, but mine was, they only bored about 50cc more total to it, but you can find K&N filters and various stuff on it as well, plus down sizing the sprocket will better your gear ratio so you won´t be looking for a 6th gear again