3700 rpm !!

[andrewslarge]

Congratulations on your found by the side of the road self propelled push mower?

 

[Auto Doc's]

I found the problem everyone. I removed the carb and discovered the throttle butterfly blade had some how come slightly loose and jammed in the throat of the carb. That severely limited the ability of the throttle to move via the governor. Thank you all for suggestions.

Thanks for letting us know B,

These are occasionally "slide in" throttle blade (on some models). If it has a small center screw, it will need some Loc-Tite to prevent it from happening again.

 

[sgkent]

unusual issue. Many of these carbs the last 20 years use a couple small punch marks to hold the butterfly in place, and no screws. Kudos for finding that.

 

[slomo]

Little detective work and she is mowing again. Nice job.