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The governor spring adjustments
on a racing lawn mower it would be good, just rev up your engine and will engage.
Revving up and down is usually a symptom of a dirty air filter.
If you mean the engine will rev up and down as it is running, it has been my experience that a dirty air filter is a cause of the fluctuation.
not getting gas. clean\carb rebulid needed
Unless you have an old farm tractor or lawn mower the rev-limiter or governor on todays cars are operated electronically by the PCM (Powertrain Control Module).
maybe your riding the clutch
Well if you are standing still and not riding down the road. An you rev the engine that high then it sounds like a rev limiter. Which is designed to protect the engine from the rider, when the "rider" does such silly things like missing a gear or seeing how high it will rev. Hope This Helped. you need to warm it up more.
Bow Down by Rev. Robert Smith Jr.
The Song That Rev Theory Singwhen Randy Orton is coming down the Ramp is "I Hear Voices"
Push the gas pedal about halfway down, then release it real quick.
your air/fuel ratio