Yeah they are, especially the carbs. I can get racing parts for one off arc racing, but that's just flywheel and rod. It was a pain for me to track down a crank for one to replace the odd size crank in one that I have.
A friend had a riding mower in his field he gave to me, I had that thing running after about a week of waiting for parts, then I put a new blade belt and new blades on it. I had about 100 bucks in it, and I sold it for 500 bucks. Not bad for a weeks worth of work.
Having trouble with a frozen shift cable. Got the rear rack on it. The pull start is just to get it started. It'll be gone when I'm done with the build.
The double kick stand will be replaced for the stock one.