^^^^ litigation^^^^
without insurance, you cant sell to just anyone.
some idiot will manage to break anything you sell in less than a week. if you dont know them, even if you do know them... uh oh. sue sue sue (hi, is your name sue?)
profit margin is staggeringly low.
you have no background experience. customer says it doesnt start...what do you tell them?
can you tear the engines apart with your eyes closed? and more importantly, REASSEMBLE said engine afterwards?
get them to start up on the first kick/pull etc?
can you turn around after a hard day spinning spanners and tell them "that will be $400 for parts and labour" when the engines worth only $200? despite the fact you just spent 12 hours getting greasy and frustrated... 400/12= a pretty lousy rate, though not bad for a 16 yr old
deal with an irate customer?
heres a good book to read...
(yes, he posted it to a forum board, as well as publishing it as a book... i just love his sense of humor, even his website is hilarious. a take it or leave it attitude with no damn frills!)
http://www.head-fi.org/t/701900/schiit-happened-the-story-of-the-worlds-most-improbable-start-up
these two guys had EXPERIENCE. they also had a partnership, something that REALLY helps.
it takes a lot of effort, a lot of heartbreak, and a lot of downright luck to start a successful business...
you need suppliers, the ability to buy in bulk, cheaply. capital. the ability to persuade and or pass the buck...
and of course, being what they are...you are RISKING ANOTHER PERSONS LIFE.
something to think about.