What I did once was use a large diameter carb like the one pictured above. My carb was off a bigger motor because the jet was too lean. Motor was cutting out at top end. I simply matched the jet with an equal size drill bit then tried one size larger bit at a time. I bored out the jet till it ran right. I had it on a small utility race runabout. I simply added on a 17" pitched prop I had done, and advanced the timing stop up a tad. I was able to achieve 51mph. That's all I can tell you. I think I used 1/16" or a smaller bit, but I really cant remember.
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