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Exl8000 generator speed governor problem

RPM's do not increase as load is applied. Wondering if I might be missing a spring on the throttle linkage assembly?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Coleman generator OHV3000

The carburetor is probably clogged up. Mix a bottle of carburetor cleaner with the gas to see if that would help. Also check/replace the fuel filter.

Posted on Sep 10, 2008

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  • 1383 Answers

SOURCE: Porter Cable 5500w generator (10hp BS) will not regulate speed.

While attending college I worked at a tool rental center and learned a great deal about matching generators to customer requirements and troubleshooting customer owned units. There are simple tests that you can perform, however, first some info on what to expect from a generator. Most generators are overrated and under powered. You should only expect to get about 60 - 75% of rating. Example, a commercial honda 5000w generator has an 11hp motor that can only produce about 9.5 hp at 3600 rpm. If a customer needed 5000w of power, we would rent them an 8000w generator because as the generator is loaded to max the voltage will drop. You generator will probably only provide steady voltage ex. 115v at 60 cycles to about 3500w then voltage will begin to drop. New generators have automatic voltage regulator that varies the power to the armature increasing/decreasing the power of the magnet. These voltage regulators suffer a high failure rate and are expensive. If your generator is not giving you 3500 watt at 115v 60 cycles your engine may have a few problems and your power generator end may need tweaking. (I would not expect to achieve 5500w at 115v with briggs 10hp) .
The governor is about 2 inches in diameter and turns off the cam gear inside the engine. It is flyball type with two or three small arms that react to rpm. The faster the engine turns, more force is applied to the governor arm to reduce engine speed. Easy to test, with engine running use finger pressure against the arm to increase speed and you should feel a greater resistance as the engine speed increases. Another simple test, remove air filter to expose butterfly inside the carb. Move the governor arm and check that the butterfly opens fully. If it does not open fully linkage and governor is not set correctly. Next, start engine and load generator up to max and check that butterfly opens to full as the load increases. When the butterfly opens all the way under load the engine is at max. Add up the wattage of all the tools/appliances you used to load the engine to get an idea of max load . Lets assume that the shop adjusted the governor properly, if the governor was not working the engine would over rev. and damage would occur. As you were told the governor spring controls speed and can be adjusted somewhat by bending tab or adjustment screw. But a review of your generator manual or that series of briggs engine will show that there are several governor springs available and different placement holes on the governor arm to attach the spring that will change the power curve. Pulling on the spring can only do so much, however changing the spring to different gauge /turns/material or differnet location on the governor arm will cause the engine to perform differently. These springs are sold thru briggs dealers by part number for your engine. This would be considered tweaking to get a different power curve.
Now for the generator. Some generators have a capacitor incorporated in the windings. This capacitor must measure within 95% of rating. Remove from circuit for testing. Finally look very carefully at the commutator rings for any evidence of brush bounce. If the brushes do not perfectly seat you will lose power. If your generator is brushless you can only hope that the diodes are within spec. because it is too difficult to test them. They also must be removed to test. Finally if your generator has an automatic voltage regulator the only test would be to replace with a known good part. At the rental center we stocked spare parts so that we could quickly find fault. There is soo much to learn and the life too short. I hope this helps good luck, please email your questions.

Posted on Dec 27, 2008

  • 10 Answers

SOURCE: Porter Cable 5500w generator (10hp BS) will not regulate speed.

The governor on you engine is mechanical and the problem should have been fixed by the generator techs unless the company is a joke. You can't work on genset and not be able to understand and adjust engine governors. The other solution posted was very good, but normally on a briggs unit the external spring that forces against the governor fails, breaks, holding arms are bent, or the carburetor is dirty and needs to be cleaned and inspected. I would push against the governor arm on the engine and check to see if it resists against you pressure. Also if you run the engine up and let go of the governor arm it should not droop(slow down) much below its normal speed. If it does resist you know the internal components are working. Then check to make sure that you have the external spring on the governor arm. If it is there look for an adjustment. The spring will either be connected to a plate that has an screw to adjust the spring tension, or holes that you can place the spring in to set the tension. Play around with that first. If you still have the same problem its probably coming from the carb. Little carbs easy get dirt in there ports/jets, and if you rarely run your unit the fuel that is left in your carb will go bad and clog up your primary jet. Remember when adjusting your governor that any changes will effect your engine speed and will have to be adjusted back to 60-62 hz with your carb or governor speed adjustments. I recommend a little over 60hz so that under full load you unit will be able to handel it.

Posted on Feb 03, 2009

  • 1 Answer

SOURCE: need pictures of governor springs and governor

model # 12f702-1824e1 mower( that uses weedeater string) had a spring come off the carberator and I don't know where to put it back on.

Posted on Apr 19, 2009

  • 57 Answers

SOURCE: Need linkage hookup diagram for Toro Super

Go to TORO.com and view parts for your model.

Posted on May 19, 2009

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Can I change a 10hp generator motor with an automatic throttle to a manual throttle?


Yes, you will be able to control the throttle. Look for a lever that pulls on the governor spring. On some generators, the governor spring attaches to an arm with adjustment screw and locknut or metal tab that bends into position. All that you need do is to pull on the governor spring to increase rpm. The governor spring pulls on the governor arm that is attached to the fly weight governor inside the engine. The fly weight is turned by the cam gear in most cases and the force that it produces is constantly trying to close the throttle. The governor spring provides the counter force to open the throttle. Without the governor, the engine can over rev. Good luck with your project.

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There are many different models of Briggs used however simple methed is to find the governor shaft. Attached to the small shaft will be a lever with the governor spring and linkage that connects to the throttle. One end of the governor spring attaches to the lever and other is attached to either an adjustment screw with locknut or metal tab that can be bent. Increasing the pull of the governor spring on the lever will cause the engine rpm to increase. Bend the tab to allow for greater pull or adjusting the bolt with locknut. Make sure that the engine is not turning much more than 3600 rpm. Use a digital meter with Hz setting to set the output cycles at 60. When set at 60 cycles the engine should be turning about 3600 rpm which is where the engine develops max power.

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Hello, it seem that you are having a Governor problem. On the throttle side of the carburetor (second one back from the front of carb) this the throttle. There a lever/spring and rod the go back to the side o the engine block. Their is a angler clutch in the crank case. As load is applied to the generator this will slow the engine down. This will causes the governor clutch to spring slower which in turn will pull the Governor rod back---by pull back the rod this will open the throttle for more rpm.. The same with no load, the governor rod will slow down and will semi close the throttle place letting the engine/generator idle.
Now, if this governor system is working. Then look at carburetor. Their is a nut or screw in type solenoid that holds the fuel bowl on. Remove this solenoid/bolt and clean out the settlement bowl.
If it has a fuel filter then replace. Another thing here, if the is old fuel in the tank drain it out and clean out the fuel tank. Modern gasoline is good for about 4 months of storage, and after a while it gets really gunky. It is just cheap fuel with high prices. I pump Ethanol premium fuel for 18 cents/gal.---regular was 12/13 cents/gal. quart of brand name oil was 22 cents and recondition oil was a 5c/qt.

First thing, how old is the fuel?, does the settlement boil have gunky in it?, does this generator have a fuel filter? and finally does the governor working properly. I wish you luck buddy. GB...stewbison

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I have a 6.5 B&S engine on a RYOBI lawn mower That will not come up to mowing RPM. the mower does not have a throttle cable and the spring on the throttle appear to be intach. The engine starts real...


Normally when you move the throttle control on the handle, all that is happening is that governor spring tension is increasing or decreasing pull on the linkage /governor arm. With engine off and plug wire removed, look for a small shaft coming out of the engine with an arm attached. Attached to the small arm will be linkage to the throttle on carb.. So when you move the throttle on the carb with your finger the arm moves also. There should be spring connected to opposite side of governor arm connected to throttle control at the handle or small lever or metal tab. When you incease pull on the spring, the engine will speed-up. Adjust as needed. Good luck

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The engine on your generator is also used for other applications some of which require an adjustable  throttle control. On a generator the engine must turn about 3600 rpm to obtain proper output of voltage and cycles. Upon further inspection of your throttle/governor you will probably find an adjustment consisting of a screw, nut or a tab on one end of the governor spring that can be reset for proper engine speed. (tab can be bent for more or less tension on spring) To check present governor setting, use a volt meter that has frequency setting. Make sure that generator is set to about 60 hz. (3600rpm) Good luck with your generator.   

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A friend of mine had one of these units, it was doing the same thing. Opened it up and found one of the two field diodes bad. Went ahead and replaced both, about 3.50 ea. Full power under load now

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I have a honda engine gx620 coupled with my generator and in tern connected through a power center to charge batteries and sync with my inverter. It's showing only 60hz dropping to 59hz and I need to know...


You did not mention how many amps your system is producing/drawing, however I don't think that you need to adjust the governor. Your engine can produce 18 hp at 3600 rpm. At 3600 rpm your generator is producing 60hz or cycles. As the load increases /decreases it has an effect on the governor thus the change in cycles. If the load increases past the capacity of the engine, the cycles will drop. To stabilize, reduce the load. 59hz is produced when the engine is turning about 3550 rpm. If you increase the speed of the engine to compensate cycles may increase past 60hz. 3650rpm will probably produce 61hz. Engine speed could be fluctuating due to other reasons (vacuum leak, dirty air filter, plug, etc ) if there is only a small load on the engine/generator. If you would still like to adjust the governor please email the load on the generator and I will help with instructions. Good Luck with your generator it is a very nice unit and built to last.

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2 Answers

Porter Cable 5500w generator (10hp BS) will not regulate speed.


While attending college I worked at a tool rental center and learned a great deal about matching generators to customer requirements and troubleshooting customer owned units. There are simple tests that you can perform, however, first some info on what to expect from a generator. Most generators are overrated and under powered. You should only expect to get about 60 - 75% of rating. Example, a commercial honda 5000w generator has an 11hp motor that can only produce about 9.5 hp at 3600 rpm. If a customer needed 5000w of power, we would rent them an 8000w generator because as the generator is loaded to max the voltage will drop. You generator will probably only provide steady voltage ex. 115v at 60 cycles to about 3500w then voltage will begin to drop. New generators have automatic voltage regulator that varies the power to the armature increasing/decreasing the power of the magnet. These voltage regulators suffer a high failure rate and are expensive. If your generator is not giving you 3500 watt at 115v 60 cycles your engine may have a few problems and your power generator end may need tweaking. (I would not expect to achieve 5500w at 115v with briggs 10hp) .
The governor is about 2 inches in diameter and turns off the cam gear inside the engine. It is flyball type with two or three small arms that react to rpm. The faster the engine turns, more force is applied to the governor arm to reduce engine speed. Easy to test, with engine running use finger pressure against the arm to increase speed and you should feel a greater resistance as the engine speed increases. Another simple test, remove air filter to expose butterfly inside the carb. Move the governor arm and check that the butterfly opens fully. If it does not open fully linkage and governor is not set correctly. Next, start engine and load generator up to max and check that butterfly opens to full as the load increases. When the butterfly opens all the way under load the engine is at max. Add up the wattage of all the tools/appliances you used to load the engine to get an idea of max load . Lets assume that the shop adjusted the governor properly, if the governor was not working the engine would over rev. and damage would occur. As you were told the governor spring controls speed and can be adjusted somewhat by bending tab or adjustment screw. But a review of your generator manual or that series of briggs engine will show that there are several governor springs available and different placement holes on the governor arm to attach the spring that will change the power curve. Pulling on the spring can only do so much, however changing the spring to different gauge /turns/material or differnet location on the governor arm will cause the engine to perform differently. These springs are sold thru briggs dealers by part number for your engine. This would be considered tweaking to get a different power curve.
Now for the generator. Some generators have a capacitor incorporated in the windings. This capacitor must measure within 95% of rating. Remove from circuit for testing. Finally look very carefully at the commutator rings for any evidence of brush bounce. If the brushes do not perfectly seat you will lose power. If your generator is brushless you can only hope that the diodes are within spec. because it is too difficult to test them. They also must be removed to test. Finally if your generator has an automatic voltage regulator the only test would be to replace with a known good part. At the rental center we stocked spare parts so that we could quickly find fault. There is soo much to learn and the life too short. I hope this helps good luck, please email your questions.

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Low voltage


Most generators use a flyball type governor within the engine to control rpm; also there is a voltage regulator that tries to maintain voltage at about 115v. The voltage regulator varies the voltage to the armature increasing /adjusting magnetic force. Use a meter with htz or freq setting to adjust engine governor to 60 cycles. When the generator is producing 60 cycles, the engine should be turning 3600 rpm, max power range. At 3600 rpm the voltage should be 115 to 120 volts. Loading the generator will cause governor to try to maintain 3600 rpm. Check engine manual for proper adjustment of gonvernor and linkage. The governor mech should last the life of the engine, however governor system does wear out. Expensive repair. enjoy

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