my bike is pretty new all stock no work done to it. just started cutting out when u give it gas, doesnt do it all the time. u can ride it for a few min. then it will start missing, if u rev it a few time it will run good for a few 100 yards then start missing again. doesnt matter if it is warmed up or not misses either way. i took the parking brake off. i changed spark plugs (br8se) it still misses. my gas is mixed 32.1 93oct castor 927 oil.