first you will need to determine if it is surging due to a fuel issue or governor issue. to do this hold the throttle linkage at the carb from moving. slightly higher than at idle. if it stops surging then it is the governor that needs to be reset. if it continues to surge then you have a fuel issue
Your lawnmower may be surging due to issues with the carburetor, air filter, spark plug, or fuel system. To fix it, try cleaning or replacing the air filter, spark plug, and fuel filter. You may also need to adjust the carburetor or clean the fuel system. If these steps don't work, consider taking your lawnmower to a professional for further inspection and repair.
i have to say Honda or toro
plug it in and push the on button
http://www.planopower.com/store/honda/index_mowers.shtml
six
There's no governor on a Honda Nighthawk 250. A Honda 250 Nighthawk is a motorcycle, not a lawnmower.
Honda 215 lawnmower
you press lightly on the brake pedle
Gasoline.
6.5 at 3600 rpm
If it has an idler control valve, and most do, I'd go with that.
There is none you suck the oil out with a pump provided by the dealer.