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Hi Lloyd, At the moment Im working on pistons. I bought piston and ring kits for a honda gx25 which are 35mm and close enough for bore size that I can make them fit. Ill turn the pistons down a bit and enlarge the liners a bit. The pin heights are about .050 different so the rods will need...

Sure, Here is an example. For a bore size of 1.35" we want an uncompressed gap of about .140". (scale that proportionally to whatever bore size you are working with) Find the circumference of 1.35= 4.241" +.140" gap which is 4.381". Convert to diameter =1.395. This is the od to turn the ring...

I'm not familiar with Earl or his method, but I make my own piston rings if you are interested in that.

Hi Lloyd, I am also slowly building one of these engines as well. I would say I'm about 1/2 way done at this point. If you have any questions that you think I can help with just let me know.

Did you get what you needed yet? I have the castings, plans, and gears etc. for this engine. I'm in the process of building one now.