i dont know if any one else has had this problem but i got mine about 2 weeks ago.. broke it in and all that good stuff and ran it once at the track and noticed it wouldnt stay started and had a nice grinding noise coming from the clutch bell area.. so i took it to hobby shop to have them look at it and they pulled the motor and took clutch bell off and it had no back bearing in it from the factory.. so i got all new parts it chewed up the fly wheel with the bell housing. so they had to replace the hole clutch assembly..