You have been well advised by these good folks.
Now that some more experienced builders have had their say...
back to post #2.
I would start by checking your local craigslist postings for similar sized generators. That'll tell you what yours is worth- be patient, don't sell it too cheap.
Then I'd have fun tuning/ cleaning up the one I had, and sell it. It's good experience too; fuel, compression, spark, everything you'll have to deal with on your M.A.B.
Hard to get a decent genny around here for less than 4 or 500, and that is plenty of loot to build yourself a fast chain drive gas-bike. And it will operate safer, better, and waaay cooler than one you put together without the right stuff.
I'm all about making what you need, but your situation is screaming "kit". Once you get the bugs worked out, you'll KNOW what you need to do to build one from scratch.
One very important thing: there is no use for wood screws on your bike. You should use only the hardware that comes with your kit- or better yet, use that extra money from the genny sale to buy good American made bolts and such. When you get to that point, we'll help you out.
Your threads were merged together because they're basically the same thing. It took me a while to learn, but just ask your questions here. No need to start another thread, you have the attention of some very experienced, helpful builders right here- pick their brains!