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Author Message   Hillbilly Posted on Thursday, April 24, 2008 - 09:16 pm:        I have a 98 S1 with 63000 miles on it.I just bought some nice used xb9 pistons on ebay with cylinders and new rings for $70. shipped, that look like new. I will get xb12 heads next.Since I have so many miles on the bike the question is are the cylinders xb9-S1 the same so I can use the low mile xb9s with pistons?I see there are some small differences on the outside.   Phat_j Posted on Thursday, April 24, 2008 - 09:35 pm:        inside is the same   Loki Posted on Friday, April 25, 2008 - 11:14 am:        The 9 and 12 heads are the same. The 9 and 12 pistons are different. XB heads/cyls will bolt on to the S1 bottom end. As a side bennie for the swap, the extra cooling fin area is a blessing hanging out in the wind.   Hillbilly Posted on Friday, April 25, 2008 - 10:16 pm:        Thats great..Thanks

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