I had a Piranha 140 in my street legal 1994 CT70 for 7 years. I rode it for a few thousand miles and loved it. I got a good deal on a pitbike rolling chassis and swapped that 140 into it. My CT70 needed an engine. I bought this engine thinking it would be stupid fast and insane to put it in a CT70. With 17/31 gearing and Maxxis M6024 130/90-12 rear tire this engine feels right at home. The 5 speed transmission is awesome! I haven't tested top speed yet but I'm sure it will do quite a bit more than the 65mph my 140 could do.