I bought my first kit 11 months ago and previously have no experience working on engines. I'm happy with how much I've learned about 2 strokes, carb tuning, and rebuilding engines. A circlip failure blew up my original yd100, I stripped the case putting on the studs on the next one I ordered, and now I have a wildcat pk80 I've been beating on and put on many new top ends (like I said, my fault). I applied the knowledge I got from tinkering on bike engines to my wheeler.
I'm currently waiting for parts to put her back together again, with matched case transfers and a pz22 carb!