i got a new starfire t40 only the other day, but every time i go out on it say a mile it keeps blowing a gasket. i am constantly tighting the head bolts down, just leaving it ticking over for awhile and i find that i have to tighten them again and again. when it first starts and goes it goes well, but then it loses power slowly but surely until it stops running, then its hard to start again.(gasket) and now i have snapped a stud.. any idea's would be most welcome. thanks alan..