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can the R1200S engines go to 106mm or only the HP2S cases?
106 mm for the DOHC engines, not for the OHV engines.
How do they get from 73mm to 76mm stroke on the crank?
Yes , with a new crank. But fits in both engine types
(125 mm rods and pistons for 128 mm rod )
gaskets are the tri-metal type like the originals.
These are the orginal 101 mm , only the laser cut to 103 mm
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