1. Hey! The governor will limit the speed to 3600 rpm and it can withstand it for a long time without any problem.
      If you mean to ask, how much rpm the stock engine can withstand, the speed without a governor is limited to around 4600 rpm, and the engine should be fine even if you run full speed for long time.
      However, if you change the valve lashes, then the stock rod and flywheel can fail.

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