Question about Coleman Sport 1850 Generator

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Engine speed varies

Coleman Pulse 1850. It seems one of the governor speed springs is missing and the engine speed is not constant. Anyone have a diagram or picture of the springs for the speed control?

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  • warren914 Sep 13, 2009

    I found the problem. The governor lever was snapped and the weights on the governor wheel were chewed up a little. No further damage or problems were found inside. New parts are on order. I'll have a closer look at the carburetor if necessary once the generator is reassembled.

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If the unit was stored for a long period of time (6-12 mo.) with gas in it, you may have a gummed up carburator. This is the most common problem with generators (lack of use)
The carb. would have to be removed & cleaned, specificly, the high & low speed jets

Posted on Sep 12, 2009

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Governor linkage


There are two main types of governor and the centrifugal type tends to be reserved for heavier stationary type engines. Most portable lightweight appliances use a vane-type governor where a vane is placed adjacent to the cooling fan so the faster the engine revs the more air is moved and the more the vane will move against it's restraining spring.

There is a spring biasing the throttle to fully open and this spring is connected to the throttle or speed control lever.
There is a link connecting the throttle to the vane. After starting the engine speed will rise until the governor vane moves under the rush of cooling air forcing the throttle butterfly to close against the spring pressure until the vane pressure and the spring pressure are equal and therefore a constant engine speed is achieved.

Moving the speed control lever to increase speed tensions the spring and opens the butterfly causing the engine speed to rise until the vane force again equals the spring pressure.

This is a fairly basic but very common type. There are variations using two or three springs but the principle remains the same.

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Do you have any volt,amp meters, that can tell where I can set the governor to? These dials are fixed to the generator. Hum...


No gauges can set the governor . The governor controls the engine at a set speed, as the load on the generator varies so does the engine speed ,the governor tries to keep the engine speed constant.

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Gravity feed fuel systems are the most simple and reliable way to deliver fuel to the engine, however suffer from a couple of problems.. As the engine heats up fuel tends to be pushed out of the carb back into the fuel tank and if the vent in the gas cap is not working properly fuel lock (or a slight vacuum in the tank) will prevent fuel from entering the carb. There should be a plastic block or manafold seperating the carb from the engine to keep the carb from overheating. Some engines have this block bolted to the engine, then the carb bolted to block., others have two bolts thru the carb and block to engine. In ether case make sure parts are held tightly together so no vacuum leaks thru gaskets.. One should make sure that the gas cap is venting. Sometimes fuel sloshing in the tank will clog the vent-hole in the cap. Try running the generator with the cap loose to see if this helps.. Replace fuel cap as needed if vent is clogged. Good luck with your generator.

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check your governor and linkage for build up of dirt and grime. You should be able to move the governor by hand, with some resistance from the springs. The governor arm should not rotate about the shaft protruding from the engine.

If governor seems to be in order, and engine cannot maintain RPM that it needs to (hunts), look towards the carburetor being fouled (clean out best you can, but don't soak since it is an EPA carburetor), air cleaner dirty (replace even if looks good), or loss of compression (check with compression tester, should be around 90 psi or better with engine warm).

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The engine should run at 3750 rpm at no load. If that's OK then you may need to troubleshoot the capacitor inside the end of the generator opposite the rope. Since the thing has been stored for some time you may just need to flash the field of the generator to restore the residual magnetism in the rotor. The easiest way to do this is thru the 110 outlet but it's a little dangerous. Plug an old lamp cord into the outlet, start the generator, and momentarily connect a 9 volt dry cell to the wires, then shut the generator down and see if there is 110 when you restart it.
Regards,
Carl

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1 Answer

ENGINE OVER SPEEDS WHILE RUNNING


This is almost surely a problem with the governor, check it like this.
Have someone with a finger on the kill switch.
Watch the governor arm while starting the engine, if it does not move almost immediately after starting the engine it is broken.
This is not a simple repair as it involves taking the crankcase apart, you'll have to contact robin/subaru to get a parts list in order to get the right governor spool and weights.
For an experienced technician this is about a 2 hour repair task.

Hope this helped,
Carl

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