Brought a used one used 3 times m2r 90r. Put on a new carb, new solenoid, new stater switch, new tank of fuel ( high grade ) stripped and cleaned carbon, new battery, doubled spring the throttle as it didn't return. And still no start. Starts for a fee seconds with easy start spray. Customer service just suggest buy the next part. I will exceed the cost of the bike. Truly low quality parts and they rely on good reviews where customers have been lucky. This is not the case. There is no info on carb set up nor do they know. 1 week trying to fix it, missed a track session, drove to the outlet to get the part and some crucial parts not in stock. Their suggestion and you will love this, buy all the parts you think and send back what you didn't need. Never buy any pit bike of any make because this is equalivent to a Christmas cracker, limited use, wear put quickly. Same as turning the tap on with the plug open.