Kit the za-50 with a 70cc Airsal ! Big carb, Good pipe and radical gearing! When it does break, eventually, then get an E-50, and put all the same parts on that. The clutch on the E-50 will have to be modified a bit, to pull the gear. But enjoy the ZA-50 til then . And if you decide to sell the ZA-50, email me!Please! Thanks, Brent