The 212 swap is always the easy way out. 4 years ago, just for fun, I took my yellow DB30's low hours 97cc and worked it. Side note about the 97cc....they take a long time to break in....the longer they run, the better they run. My Uncle's is 9 years old and runs great. So, if you get bored and want to tinker, try these steps: 5W-30 synthetic. The manual says use 15W-40....they were smoking the good stuff when they printed that. The tiny rotating assembly struggles to push that motor honey around. Break out the pin vise set and open up the jets. Go one step larger on the pilot jet, and start with one step larger on the main. Read the plug and jet accordingly after that. They're way too lean from the factory, and a lot of people say they have to run on half choke because of that. HotRodMiniBike isn't around anymore, but their PMR jackshaft kit was really what these pathetic engines needed from day one. I had one left over from another parts engine I had gotten from a local friend. Remove the throttle stop screw completely with the jackshaft on the engine. MaxTorque clutch with green 2550 spring. Machine the head for more compression. Step one to make more torque: raise the compression. My brother milled .045" off of the head when he was a machinist. The difference was amazing. Finally, build a header. Now I know it sounds stupid and I'll be unpopular for mentioning all of this crap, but it really made a night and day difference on that little 97cc. My Uncle continues to enjoy his, ungoverned and revving into the stratosphere, with a home made jackshaft. When I had his cylinder head machined, it made it that much better and he was really impressed. I think these are easy changes to make, and would be better suited for younger riders too...they can increase performance without flipping themselves over with a punchy 212, and learn a thing or two in the process about how engines work. My two cents, YMMV.