I have a Tillotson 212 that I run on a Trailmaster MB200-2 mini bike. I too, was interested in the 10hp out of the box stock engine. My plan was to just install this engine on the mini bike in stock form and call it a day. NOT! Didn't happen! Here's a link to my thread on the engine and move to a Mikuni carb.
https://oldminibikes.com/forum/inde...kuni-22-mm-or-24-mm-carb.164378/#post-1197279
With all that said, it appears to be a pretty solid engine. ONE IMPORTANT POINT, THE CRANKSHAFT LENGTH ON THE TILLY (LEFT SIDE OF THE ENGINE SIDE COVER TO THE END OF THE CRANKSHAFT) IS ONLY 2 1/4", VERSUS THE HISUN OF 2 3/4" AND THE PREDATOR 212 OF 2 1/2". This caused me some issues with the stock TAV setup as the driver pulley wouldn't fit on the crankshaft, too short. Valve springs (supposed 26#) use auto style retainers, crankshaft is machined well no interference issues with different cams, supposed factory 10,000 RPM flywheel, stainless push rods, and versus the HISUN stock 196cc I would say that everything is a better grade.
Does it feel like a 10hp engine out of the box on my mini bike? NO! However, I may have a serious gearing issue with my mini bike based on weight and running a TAV with 38 tooth rear sprocket. Now that I've done a build and changed out the rear sprocket to 50 tooth only time will tell when I get a chance to test.