If so, the SP bikes had dry clutches, and the SP cylinders are slightly taller than normal. All wet clutch bikes came with shorter cylinders, which have a higher compression ratio. Don't mix the two on the same bike, but you can run both of either.
It does get a bit more complicated as the SP heads were different too...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
