Hi guys!wr 450, cold start with electric start up is easy! when the electric motor is to kill start hard start, open the little tnrottle,,, letting start letting TNT, once again push the start, hop the engine starts easily! a feeling that not enough air!I bought the oil filter maxim blue bottle, much liquid! when riding sometimes shoots pipe muffler! ecu ang gytr pipe is ! Start with a kick starter is easy at this time ! any thoughts?