you can mess up an engine quick fast and in a hurry with a roto start if you dont know what ur doin (I know from personal experience)....I smoked 2 engines I bet within 2 months, I know how much it sucks to keep spending money....this is why I preach to look an rc over and check EVERYTHING when you first get it...all this is part of the hobby...learning to tune is prolly the most pain in the a#* when it comes to nitro...patience patience...if you get all excited and skip stuff your going to spend alotta money

I've only been in rc for 1yr 7 months...and to figure how much money I've put in the hobby scares me..lol....I'm far from a super tuner, still learning myself...but I'm here to tell ya..iffin ya wanna learn the hobby the hard way it gets VERY expensive

a properly tuned and primed engine will start on 3 pulls or less