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Thanks. Sounds like the next step is to pull off the cover and see if its there. Do you know if its even possible to get a crank seal for the Gemini 50cc (or the equivalent Yamaha rotary valve) engine? And do you think I can just replace the seal, or would I also need to open up the crank case...

That seems possible. The guy I purchased it from did try starting fluid on it, but that was well before the oil started to leak. It wasn't until I replaced the gear oil that the leak started. (at least not to the degree it was). Why would a blown out crankshaft seal be related to it sputtering...

So i've got this 1970 Gemini SST that is fairly complete, but not running. When I picked it up it would just about start, but only fire once or twice before eventually flooding. I did a the usual checks on the ignition to make sure there was spark, fuel lines clear, etc.. and after that, it...