After a long search, I will soon have a liner-less cylinder for my M21. I would like to make it a 720CC which means I need a 90MM piston. Who has one??????

Bruce

i too ,would like to know this as well.

From memory one that works is a VW 1800 cc piston and being an air cooled engine piston it will handle the big clearences used in out engines.

email (option): bsansw1@tpg.com.au