patentgeek
XS650 Addict
Does anyone know if the pistons in the 750 Big Fin 9:1 CR kits from Heiden and Mikes XS can be machined to achieve lower compression on the order of 8:1 to 8.5:1?
http://www.xs650.com/forums/the-garage.2/create-thread
https://www.mikesxs.net/yamaha-xs650-447-big-bore-kit-80mm-750cc.html
Or alternatively, are low compression pistons available?
Wossner manufactures 8.4:1 CR overbore pistons, but I believe they are only available for the Euro 533 crank and not the 256 or 447 cranks. I'm in the U.S. and would prefer to stick with 256 or 447 parts.
http://www.xs650.com/forums/the-garage.2/create-thread
https://www.mikesxs.net/yamaha-xs650-447-big-bore-kit-80mm-750cc.html
Or alternatively, are low compression pistons available?
Wossner manufactures 8.4:1 CR overbore pistons, but I believe they are only available for the Euro 533 crank and not the 256 or 447 cranks. I'm in the U.S. and would prefer to stick with 256 or 447 parts.