Jack221 wrote:
Well done! That must have took some finding. Stolen CM2's idea with the adapter plate.
That is indeed an M1XL 172 (long stroke like my 181 no doubt). With an expansion and correct set up it's 26bhp minimum.
Jack, these are GS150's cases- 4 cylinder stud cases. The conversion has been done many time before. With original Piaggio cases, you do have to relocate the cylinder studs.
The OP has 3 cylinder stud cases; basically every wide body case made outside the GS range. It would take an extensive amount of welding, mill work, and stud relocation to get this done. If you really want to run a cylinder induction cylinder, best to to buy a new set of 4 stud Pinasco cases. Then you can run all types of cylinders from case induction to cylinder induction.
now my opinion, it's all cool and yes, you can develop a lot of power from this exotic converison . Is it necessary? no, not at all. Pinasco and CC Corsa have it all figured out with their 3 stud cylinders. Plenty of power with 55 mph cruising and speeds well into the 60's.