Small Engines (Lawn Mowers, etc.)/B&S generator governor


I have an older Milwaukee generator with a B&S engine (100232-0302-01).  Problem is with the governor, one or more sp[rings are missing and the rpm maxes out.  This is the version where the only speed control is the knurled knob on the control rod, and the governor mechanism is inside the crankcase as opposed to the vane type.  Control rod goes to the control arm on the fuel tank mount, I presume the missing spring pulls the governor lever down (increasing throttle), increasing rpm pushes the governor link up to decrease throttle.

Question:  The long spring (item 232 in the illustrated parts list. p/n 260478_) that goes around the governor link... it looks like this just connects to the same points as the governor link, I presume to keep it from vibrating?  If so it's not critical?  It's present on mine, but not in good shape.  There's a similar shorter spring around the link that goes to the arm on the throttle butterfly.

I've tried a variety of light springs between the control arm and the governor arm (including item 209, p/n 260695 which seems way too heavy, I presume it goes somewhere else, the picture isn't clear).  All are too strong and the rpm is too high.  I've also adjusted the position of the governor lever on the shaft (both fully CW).  The governor just seems to not do anything.  Is there a way to check the internal components without opening the crankcase?  Any other suggestions?

Thanks in advance...

The spring on the carb connecting rod is to smooth vibration.  This reduces wear on the carb butterfly shafts and helps keep a more constant RPM which is important for generators.

As for checking the internal governor there is no way on a Briggs without dis-assembling.  One check you can do is with the governor arm.  If you loosen the governor arm pinch screw and can to the governor shaft round and round then the paddle is broke off the arm.

To adjust the RPMs you need to bend the governor spring arm, not the spring.  The RPM needs to be set at 3600 RPM to produce 60 Hz.

There are lots of picture on Google Images.  Briggs 5 hp governors should be very similar to what you have.


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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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