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I have my 1985 90hp 3cyl Yammie running great right now. I generally like to cruise around at 4000 to 4200 RPM. My manual says that the cruise range for that motor is 4500 to 5500. I would like to run it harder but I'm afraid to blow it up. A friend of mine explained that these old 2 stroke motors were designed to run at max cruise so pushing it isn't a big deal. Any suggestions?
