had my blasty engine rebuilt ported and polished,when i got it back she started right up....the bad thing is once it warms up and you rev to the power band it just keeps on going.i was riding one day and it did that for the first time and i didnt know what to do so i pulled the cap off the spark plug then it kept going for about five seconds.now im used to it so all i do is stomp the rear brake to make it stop reving then just keep on going,but im really getting tired of it because whenever someone wants to ride it i have to tell them no then they call it a pos and im tired of it happening i want to continue modding the blasty but want it fixed first..please help