This is what I've found. The engine uses a square bore and stroke configuration (72x72mm) for maximum horsepower output. Although the engine does not come equipped with a counterbalancer, it does have an extra weight added to the clutch side of the flywheel to help keep the engine from experiencing any vibration problems. The Gas Gas also comes with its own hydraulic clutch, which makes the clutch action exceedingly easy on the hands.
I had thought it came with it when I was researching, this is the answer I had found a bit ago on another site.
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