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Quality is unpredictable in Chinese scooters. With that said unless you're drag racing and have an engine fully kitted out worrying about grenading the engine is not the problem.
The problem is long term reliability. I think I can count on one hand the engines I've seen with a big block that have lasted more than 15,000 miles.
The more power options you put the shorter the engine life is going to be. And the failure point isn't going to be the crankshaft but the bearings and connecting rods if not simply cracking the piston.
So basically if you're just at the point of putting only bolt-ons, snapping the crank simply is not going to happen save a defective crank.
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