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I'd like to open up the bore on an O.S. rotary carb a little. I have various reamers but I was wondering how hard these things usually are? Do they need to be annealed before reaming and then re-hardened? Thanks, Ken

This is a rotary carb and fits the .12CV-R and the .15CV-R and maybe some others. Actually I'm looking for any rotary carb with a neck that will fit in these engines (.393" / 10mm or thereabouts). I could do some modification, but there's not a lot of room to play with. Thanks, Ken

OK, I'll kick this one off. Though I've been in boating off and on for a number of years, I'm a real neophyte to the customization of props. Can you enlighten me? What is meant by "cupping"? Is the whole prop blade cupped? How is it measured? How is it accomplished? How do you assure equal cup...