HagmanMod1
Active VIP Member
Mountain magic has a good selection of the Rkt piston kits in stock. 7804749400
i would say the spi are forged... machined then dipped... the wieght was 12oz lighter then the stock skidoo onces. i just went for first ride of the season last night and that machine stood on edge and catwalked for 130meters. made my day!!! totally impressed with the new power in my 800r with spi pistons!! i might have the extra power from also adding v force reeds??
I was told that Weiscos are the only piston that's forged. They are heavier, with more clearance for expansion.