It's entirely possible that it just has the automatic clutch that engages with engine RPM. My sons GIO Mini-Beast (110cc I believe) had no shifter or reverse, and I bought it new. It was just gas and go. I never had the clutch side cover off though, so I can't be of much help there. It didn't have a ton of torque though so it wouldn't surprise me if it just had one of those little centrifugal clutches like go karts come with.
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