Scrambler 400 might be nice, but I can't seem to be able to get it around my brain to use anything else other than yamaha. Hmm maybe 'shee or yz400f/yz426f/yz450f or even a yfz engine, although then comes in the question to whether or not it would be worth doing this project at all. Which I think it would, because then I would be paying for a full quad and then just upgrade things anyway.
Any input?