SnapperLawn Mower 8 hp Tecumseh engine runs only on high speed.
The governor does not increase engine speed when it has a load put on it and the engine stalls. This all started after the engine shut down and I could not start it. I then tried to re-set the speed and idle like I have on a Biggis & Stratton engine.
I still could not start it and took ff the air cleaner off and found that the throttle cable had broken and replaced that. The engine has never run right since. My attempts at adjusting the engine have failed.
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Re: SnapperLawn Mower 8 hp Tecumseh engine runs only on...
first check the governor linkage.The link with the governor sistem from crankcase is the lever(arm) with some holes.To encrease the sensitivity, raise the spring into the next higher hole in the arm.To descrease the sensitivity,hook the spring into a hole lower than its original position.If you need more info just tell me.
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The engine revs are turned down to make the machine noise compliant, increasing the revs will greatly increase the noise, the engine revs shouold not realy be increased, however a dealer with a suitable engine taco may do it for you, it is very important not too over speed the engine or it will self destruct,
Usually when you have a lower voltage output that is yet above 150 VAC the problem is as simple as the engine is no longer running at full speed. This could be caused by binding carb or governor linkages but more often than not the Governor adjustment screw has backed off over time causing the engine to gradually slow so the output voltage drops. The user does not notice it so much until the output drops more than 15% and you notice dim lights... slower running equipment etc.
Look for a circular plate / governor speed plate near the base of the governor lever but off to one side that has a spring that attaches to the governor lower end of the governor. There should be a screw with a locking nut. Loosen the nut and turn the adjusting screw clockwise to increase engine speed. (You may have to barely loosen the pivot nut on the governor speed control adjustment plate to make the speed adjustment.... tighten when done with speed adjusment) Watch your output voltage and adjust the voltage to 225 VAC with NO LOAD. The voltage will drop as loads are added. Make sure to tighten the lock nut on the adjusting screw or in a matter of an hour you will have low voltage again from engine speed dropping. What ever you do.... DO NOT adjust the governor arm base attach point where it attaches to the engine.
Just so you know a weakened governor spring can cause the speed drop also. If the speed keeps dropping with extended use, you may have to change the spring that goes from the lower end of the governor arm to the governor speed adjustment plate.
Hi, I will try to help you out. I think it just needs adjustment, probably the high speed mixture needle located on the bottom of the carb. Get it running at high speed and try to turn the screw in 1/8 turn increments. It sounds as if it might be flooding out. Turn in (clockwise) 1/8 turn and wait a little, it takes a few seconds before you hear the difference. If it seems to run a bit better try that again, if worse turn back to original position and turn it the other way to add more gas to the mixture. If a bit better try that again and listen for the difference. If that that does not work at all try the low idle mixture screw which is located on the side of carb, it has a spring on it just like the high mixture screw. Do the same as previously described and see what happens. Some might say the low needle has nothing to do with the high speed, but it does have some effect as you will notice. Bring to idle and adjust for smoothest speed. Other things that could cause that is the fuel tank cap vent hole might be partially blocked. (if you remove fuel, air must be able to enter so a vacuum does not stop the flow of fuel). Something that happened to me is that the shut off valve under the tank gradually closed with the vibrations causing low fuel flow. The carburetor might need cleaning or the fuel filter might be plugged. The gas tank might have dirt in it limiting fuel flow. The governor might need adjustment. With the more load you put on the engine, the governor should feed more fuel to the engine to compensate. Is there an air filter on this engine, if there is check it out and clean or install a new one. That is about all I can think of right now. Without hearing it run it is difficult to give you an exact fix. All the best and hope this is a bit helpful to you. Good luck. Will gladly answer any other questions.
One of the most important parts of your engine is the engine governor. An improperly adjusted governor can shorten your engine's life. If engine speed is not controlled, the engine will destroy itself. Never run an engine over speed, especially without a load attached to it. Even for a short period of time it can cause catastrophic failures, like blowing the magneto magnet into 100's of little pieces. Over speeding is something that needs to be taken care of immediately, because it can be a real hazard with metal coming loose at high speed. This page will explain how to adjust the mechanical governor on Briggs and Stratton and Tecumseh Engines. First, let's understand a little more about governors and why they may not be working right: Most complaints about governors fall into two categories:
Engine runs too fast or too slow.
Engine surges or hunts.
You should do an inspection of the governor linkage and spring before trying to solve either of these problems. Make sure everything is operating freely and the spring is not damaged or stretched. Also, check the governor static adjustment to see that all free play has been removed between the spindle and carburetor. The best way to do this is to move the throttle from idle to full open and note the way the governor shaft moves. If it goes clockwise, then loosen the clamp screw and with the throttle wide open turn the shaft all the way clockwise and re-tighten the nut. Make sure the throttle moves from idle to full open freely after making the adjustment. Refer to the engine repair manual for exact adjustment procedures. After you have made the above check, restart the engine and see if the governor now operates correctly. With the engine at idle, move the governor lever with your finger to open the throttle and it should push the arm back toward idle if working properly. One way to do this test is with the governor spring removed. If it still over speeds or has no push toward idle, you probably will need to have the internal parts checked inside the motor or recheck the static adjustmen
The Carbuertor Throttle is Held in the Full Open Position Until the Engine is Started and Running, then the Governor and Spring Work together to Keep the Engine RPMs to the Desired Setting.
The Following is an Explaination on How the Governor System on Small Engines Function.
>>The Governor System behaves like an Unending Tug of War between One of Two Governor Springs, which Pull the Throttle Toward the Open Position, and a Spinning Crankshaft, which Tries to Close the Throttle. When the Load on the Engine Increases - a Typical Example is when you Move your Running Lawn Mower from the Driveway to the Grass - Crankshaft Revolutions Drop. But the Governor Spring is Still Tugging, Causing the Throttle Plate to Open. In Response, a Larger Volume of Air-Fuel Mixture Enters the Carburetor, Increasing Engine Speed to Compensate for the Increased Load. The Crankshaft Speeds Up, and the Tug of War Resumes, until a New Equilibrium is Achieved. With Each Change in Load, the Tension Between the Governor Spring and the Load Brings about a New Equilibrium, known as the Engine's Governed Speed. Neither Side Wins until the Engine is Shut Off. At that Point, without the Crankshaft Spinning, the Governor Spring Pulls the Throttle to the Wide-Open Position. Two Types of Governors are Common on Small Engines - Mechanical and Pneumatic.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.
whithout the engine running the gov should be trying to full throtle. when started this should tell the carb to supply or restrict fuel/air to compensate for load or the lack of. but to answer your question....yes the gov should be wide open, unrunning.
You sound like there is a "load" on the engine that it cannot handle. Maybe there is a problem in the generator somewhere that is dragging down the motor? A governor on a small engine like this is probably not the problem.
It could also be the exhaust side of the engine blocked. Try checking for a spark arrestor clogged up (there should be a screen inside a removable plate to clean)