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Yes it was/is an odd ball size. They supposedly fixed the first round of engines with a v2 (silver/grey heat sink) but it proved to have the same issue. The only difference I noticed besides the heat sink color was it took a much thinner o ring to seal the carb. I'm thinking the thought was the carb would sit down farther and get a better squeeze on the thinner o ring, but thats purely speculation. I gave up on it shortly after engine 2 had the same issues. Run great till the temp changed a few degrees then had to fiddle with it. Should have just bought another engine for it, I just hated the thought of going smaller and not being happy with what I ended up with. Oh well.