I prefer Honda lawnmower engines -- but never had a problem with a Briggs. I never liked Tecumseh engines. No experience with Chinese knockoffs.
Honda GX340's. These pos's ate valve guides after a 100 hours of use. The result - burning oil and a kickback that would pull your fingers out of your hand if had any kind of grip on the pull cord handle.
And with Honda's superior parts system, you can't just get a complete replacement head. You have to buy every single part individually, including the valve guides. The labor to install new guides (old head) was more than a new complete motor...
take a Harley Sportster engine, lop one of the cylinders off, and put it in a smaller chassis to make it one of the most anemic motorcycle engines ever this side of the Sooraj Diesel.
"You've seen it, you've heard it, and you're still asking questions?!?"
"Yeah, when do we go for a ride!?!?"