My kymco 250 EGO just dies at the top end which is dangerous.Could it be the carb? IF SO IS THERE A MANUAL I CAN DOWNLOAD TO HELP ME TAKE IT APART? Thankyou geoff

http://www.qrbiz.com/product/629641/chainsaw-connecting-rod.html

Although these answers are correct many are not probably. Valves are not going to go out of adjustment during the off season etc. You need to simplify it. You need gas, fire (spark) and air for a motor to run. Usually it will be the fact that the carb was not ran dry at the end of the season and fuel stabilizer was not used so the carb is dirty. You can pull you plug and see if it is wet with gas or try some engine starting fluid sprayed in the carb. Dry plug means no gas, no run with starting fluid mean no spark. Make sure fuel is on and the obvious has already been done. 90% chance dirty carb.

need to clean small holes in main jet (carb)

download manual from http://www.epfguzzi.com/kymcobiz/service/index.htm