Lawn Boy Speed Adjustment


Old 08-29-05, 04:13 PM
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Lawn Boy Speed Adjustment

I have replaced the vane, spring, and disc in a 21 inch Lawn Boy push (no Power) mower carburator assembly. The motor starts but immediately overspeeds. How can I adjust the speed
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Old 08-29-05, 10:30 PM
Join Date: Jan 2005
Location: 5353'57.39" N 12244'13.58" W
Posts: 189
something is wrong with the governor or the carb linkage is too short (bent)

Another problem could be: the throttle arm has a tendency to jump over the centre and try to go the wrong way which can hold it open .

Old 09-10-05, 08:33 PM
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To adjust the air vane governor's spring tension (and, thus, engine RPMs), you turn the white, knurled knob. Turning it clockwise increases tension (and RPMs), while turning it counterclockwise decreases tension.

You have to put some pressure on the knob to get it to turn. When doing this, be careful not to break the spring---it's very fragile.

Needless to say, adjusting the governor's spring tension should only be done when the engine is OFF and COLD.

Hope this helps.
Old 09-10-09, 01:58 PM
Join Date: Sep 2009
Location: Minnesota
Posts: 3
Adjusting Lawnboy governor

I have a similar problem with my 6.5 HP Lawnboy mower. I have adjusted the knob above the carb and it corrected the surging at full throttle but, I still have the problem of engine surging at lower speeds. There doesn't appear to be a fuel mixture adjustment to correct this. Has anyone found a fix for the engine surging problem.

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