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Old 05-14-2012, 09:06 PM   #2
bmwrench
Beastly Adventurer
 
Joined: Nov 2006
Oddometer: 2,036
1000cc pistons in the early R90 cylinder is risky-the oiling groove in the cylinder spigot makes it very thin in that location. It's been done (I've done it myself), but I was not confident that it was a good idea. You can buy a 92mm piston set from a certain independent shop...
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