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The straight up and down Briggs are too big, I already measured them. But I found a 10 that has the cylinder on the front, kind of like a crf50. They have the same mounting pattern and if i move the gas tank on it it should slide right in. It'll be a little tight but i think 10 hp would be a great engine, at least enough to carry me around. Should be a fun project, ill post vids and pics of me working on it.