Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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Lawnboy Model 10424 how much tension to put on the Air vane

I replaced the spring on the Air vane and know how to adjust it but do not know how much tension to put on it. The mower seens to be running rich and the throtle does not change the speed much at all.

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Mower will not idle up under load. does not stall but idle slows any help would be appreciated

John

Posted on Apr 10, 2010

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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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1 Answer

Push mower revs too high with throttle just open (or a little higher with the throttle opened more). Revs stay high until throttle reduced to cutout point.


are you sure you have the right spring fitted?? and have you tried adjusting the spring tension? you can do this by bending the arm that the govenor spring attaches to as seen in this picture
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Snapper repair manual


I believe the white flipper under the flywheel cover you are referring to is the 'air vane governor'. Its got a blade on one end that curves with the flywheel. Its on a pivot with a spring on the other end to the carb linkage. As the flywheel speeds up the fan pushes the air vane away which in turn adds tension to the governor spring. Controling the speed of the motor and preventing over revving.

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Why isn't Lawnboy lawn mower model NO. 10604 drive not working


Inspect the pulley where the belt loops on the wheel transmission. There is a tension spring, that when you pull the level, it puts tension on the belt. If that spring is missing or the pulley does not provide tension the wheels will not turn because the transmission is not being engaed..

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try www.sewusa.com repairs page for troubleshooting help. start by cleaning and oiling machine. then wind a new bobbin and put in a new needle. load bobbin into bobbin case and ensure thread goes into tension spring. now dangle bobbin case by holding thread tail, bobbin should hang in the air but release thread if you pull it. adjust the tension screw on case 1/4turns only and test again until you get it tight enough to 'dangle'. now load bobbin into rotary hook of machine and thread top. now test sew and adjust top tension in small increments if neede to balance the stitch. but if top tension is wirking okay then 4-6 range should be fine.

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1 Answer

Up and down rpms . think the air vane is out of adjustment.have taken apart carburetor ,new float,needle valve and gaskets. cleaned gas screen.air filter. spring on air vane maynot be in correct postion on...


This is almost certainly due to lean mixture. If your carb is adjustable, back out the high-speed mixture screw 180 degrees.

If there is no adjustment, then either the main jet is still partially blocked, or the carb has internal corrosion (in which case, you will need a new carb - it's not fixable).

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1 Answer

Engine runs away


there is a plastic vane that moves in response to the air flow created by the flywheel fan ... the faster the motor runs the more air and the more the vane is deflected .. the vane is connected to the throttle thru a spring .. as the vane is deflected it reduces the throttle setting to maintain a set speed (which is adjustable by a screw) ... if that vane becomes stuck by a leaf or twig then you lose that speed control .. also if it becomes disconnected from the throttle the engine will run away .. the manual on your generator will call that a "govener "

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Recently, the rope recoil mechanism on my lawnboy mower would not recoil completely or not at all. I removed the complete recoil assembly and the rope in order to rewind the coil, which appeared to be...


Im sorry but it sounds like the spring has broken. So I am not that familiar with Lawnboy but some rewinder are not serviceable and the whole housing has to be replaced .

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IT HAS A WEAK SPRING THATS ALL IT IS

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I have a 1987 commercial lawnboy walk behind mower that has stopped running. I gradually lost power over the summer and now it will not start. I have installed a new plug and filter earlier in the spring....


I would try and remove carb and clean it thuroughly. You can soak the parts in solvent or equivelant. The carb would be right after the air filter tube to the intake of engine.

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