RE: vx 18 engine trouble (hsp warhead)
thats normal, but make sure you have a good battery in your ignitor. your engine is probably damaged from being seized.... i would recomend getting a new, better one from a brand name such as os. but even better, you should just get a good car. hsp is a chinese offbrand, and they are prone to failure. they are cheap for a reason... for starting out with nitro, i would recomend the team associated gt2, or the xtm x-cellerator, just the x-cellerator parts are hard to come by and you have to order them online at hobbypeople.net. the hpi firestorm is pretty good too
best of luck to you!