Did the 72 cc kit put together correctly, timed correctly, and all hookups are correctly hooked up. I haven't put the exhaust on yet but when I sprayed ethanol in the carb it didnt start I am going to make sure valves are adjusted correctly when I get a chance to work on it. It could also be the cdi, but scoot would start and run before big bore kit was installed so I am skeptical about the cdi. I would think with the ethanol sprayed in the carb it would have started so im thinking there isnt a spark, so i am planning on gettting a new plug as well. If those things dont work I was going to take it to a shop So unless you can think of anything else let me know im open to suggestions.