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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 03-27-2000, 00:00 Post: 14211
Matt



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 Mechanical Governor

Well I have a question about a push mower(Can't get through a ditch with the cub cadet). The Engine on it is a 6 HP Quantum, Briggs and Stratton. It has a Mechanical Governor and I was just wondering If It is adjustable. I think it is but I don't Know how to do it. Do any of you guys Know how to do it, without Blowin' the motor. (Please dont ignore this question just because its about a push mower).Thanks






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 03-27-2000, 00:00 Post: 14215
Bird Senter

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 Mechanical Governor

Matt, I don't know about that particular engine, but some are adjustable simply by changing the length or strength of the little spring. I have an old 3.5hp Briggs on a spray rig and I had to shorten the spring recently to get the proper RPMs out of the engine.






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 03-29-2000, 00:00 Post: 14268
TomG

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 Mechanical Governor

I think I unhooked the governor spring on my dad's hand mower when I was a kid to get a little more RPM's out of it. Bird increased tension to do the same thing. I guess a governor could be set up either way. Guess I'd find the spring and try it out.

Keep in mind that governors on old hand mowers tend to be RPM limiting devices. These governors are not like tractor governors that match fuel delivery to load to maintain constant engine RPM. An RPM limiting governor is a safety device, and any change in adjustment should be done with operating safety in mind.

Of course, you may have a power rather than speed problem. Changing the way a governor works probably won't do much for the power. However, there are a couple of possibilities. First, you may not be getting full throttle because the mechanical linkage is out of adjustment. You might be able to see the carburetor butterfly valve by removing the air filter. With the hand throttle full open, the butterfly valve should be full open. If necessary, you could remove the carb and mark the full open butterfly position on the outside.

Second, the governor may be out of adjustment and preventing full throttle operation. This idea depends on how the governor and throttle linkages work together. In the case of my dad's mower, I could check by running the engine at less than full throttle and gently pushing a lever the governor spring connected to with a screwdriver. Doing the same thing at full throttle can check whether the governor is limiting RPM.

Third, the choke linkage may prevent full retraction of the choke valve, if so equipped






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