For my WM20 I have a original +0.20 piston, can someone tell me the correct size to drill the cylinder?
Or how much bigger than the piston?

email (option): bram@ockhuizen.com

The clearance at the bottom of the skirt should be 0.003" to 0.005" (3to5 thousands of and inch (0.0762mm to 0.127mm)

email (option): ronpier@talk21.com

Thanks Ron

email (option): bram@ockhuizen.com