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These things usually happen in sequence.
Valve sticks
piston hits valve
valve breaks and falls into cylinder while stem shoots through top
valve chunks punch through piston, scar cylinder walls
rod bends trying to push chunks out top of engine
As you tear the engine down what part of all that happened to you, if not all of it, will be obvious. You will also see the reason there really is a difference between a clone and a Honda. Hondas last 50 years and go on trips around the world.
Ease of engine swaps is controlled by dimensions of the cradle with very little electronics being involved. Motocheez has done several on his channel.
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%90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home.
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