I agree Unit 63-69 (maybe even a 71 or 72 these will likely have disc brakes on the front which is much more desirable than a drum) 650 TWIN , DO NOT CONSIDER A 750 TRIPLE, if you must have a 750 get a 650 and bore that bitch or buy new jugs that are already a larger bore. As Rob mentioned don't sweat the wiring, you will rewire it anyways. Matching frame and engine #'s(with a title) are always best, though there are ways to obtain a title , it can be a time consuming,costly, headache.
$1500-2500 would be a fair price range, depending on the condition of the machine. (i.e does it run?, has the current owner ever heard it run? does it roll? does it shift through all gears? how complete is it? whats the fuel tank look like inside, how do the carbs look?do the frame & engine #'s match, and are they un altered? is it a pile of rust, or just a pile of dust? how much more money in addition to your initial investment of $1500-2500 are you going to be able to afford ?. because you will spend more money on it.
How many tools do you have? (i.e Welder(you don't have to have a welder, but it certainly makes things much easier), Grinder, Sockets, Ratchets, Open end /box end wrenches,, screwdrivers, drill(press) ,sawzall, are some of the more useful items) Then you get into some of the "specialty tools" like Whitworth wrenches, gear pullers, drift punches,etc. Are you confident in twisting wrenches? on 45 year old parts? Do you have an area in which to work on the bike, garage, spare room, etc. ? These are all things to take into consideration.
I wouldn't say don't buy one thats already chopped, the one you pictured, looks like a pretty sweet deal for $2500 even if the engine & frame #'s don't match, it looks liek a pretty sweet scoot, I would change a few things up on it, but it looks pretty decent. Part of the fun in it is chopping it yourself, if you get someone elses bike thats already chopped, it kindof takes some of the fun out of the process, but, at the same time, I don't see anything wrong with buying a bike thats already chopped, and changing things up on it to personalize it to your liking. just be careful what you buy, you don't want someone else's problem. The guy I got mine from (nearly 3 years ago) told me, "It just needs wired up" , well lets just say there was/is a lot more to it than that, I'm about 3k into it , and no where near ready to ride down the road legally yet. likely about another 1500-2k I will have it to that point. Until then I just skirt around the neighborhood on occasion, and rev it in the drive way at 9 a.m. to piss off the neighbors.
Best of Luck Finding Your Freedom Machine !
Last edited by starwolf; 08-18-2012 at 10:00 AM.