I have a Briggs OHV (Intek?) snow engine, Model 12c113 series. The
engine doesn't have a speed control, that is the engine is either
running full tilt or it is off. (I'd say throttle, but I believe all
engines have a throttle, they're connected to the governor, and a speed
control would manipulate the governor, not the throttle directly.)
Other 12c000 engines DO have an adjustable speed control and indeed
there is blank plate on mine where it would be in other versions.

My engine doesn't seem to like to go to full power immediately when it's
cold, and I'd like to run the engine at idle speed for a few minutes
after use to melt off any snow before shutting it down. Having a remote
cable to the handle isn't important.

How hard would it be to add a speed control lever to the governor on my
engine? I believe the part number I'd need is Briggs and Stratton #
691028 .

Thanks!