i am thinkin a dirt bike engine of maybe 200cc. but i don't need to kill myself. and how would i build a arms. what do they look like?
how much do you weigh, IMO 200cc isn't going to last you long, if its free thats something else. I went 500cc and geared it down to WOT is about 45mph, but the benefit for me is I have torque on demand for climbing anything from almost a dead stop. you do as you please.
v8, nice looking front end bits, me likey, I robbed a 86' Suzuki 250 quad front end from a cycle junkyard, with brakes and all. I widened it 10" (47" to outside of tire now), adding a new rack & pinion as soon as I pick the right one out. I got the complete quad frame for 100 bucks, sold the rear swing arm stuff back to him for 20, the R&P is going to be about 130 with u-joint and stubby, but should be worth it.
if your going TT, I'd say v-8s got a decent system (needs to be bigger for a TT though.), beef it up and make the arms longer, for the travel for jumping.. I'd build it around a pair of s-10 spindles, cheap ($25 at most pick and pulls) and easy to work on/parts/etc. there are better ones, but those are tough and cheap, if the vehicle is light, they will hold up nice.
http://www.aa-mfg.com/ has things like ball joint cups and lots of pre-made brackets... if you don't really know how one is made, you should get a book on Suspension engineering to give you the basics to start and understand what forces are at work on the front end.
