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I have a 99 GS with bad motor from oil site glass pop out. can anyone tell me if a 03 R1100S motor will fit?
I think the case and crank are the same. You'll run into incompatibilities in the top end (exhaust header attachment, for instance).
The 1100 and 1150 are different. The exhaust header on the 1150 is a different shape and uses 3 studs not 2. Since the bore is different, I do not think 1100 heads fit 1150 easily.