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Lawn Boy Dura force Throttle Spring

15 years ago

Hello. I am new to this forum and have a question for you guys. I have a Lawn boy Dura Force and I need to replace the spring on what I am going to call the Throttle? It's the white plastic piece above the carbeurator that has a small thin spring wrapped around it. The problem started when the mower would not move out of choke. i took it apart and the spring was basically wound out. How difficult is this to replace? Any help would be appreciated. I all ready hadthe carbeurator out, so I know how to do that. I just don't know how the throttle attachs to the housing, and how to replace the spring. Thanks in advance,

Mort

Featured Answer

1saxman

15 years ago

I think you mean the governor spring in the base of the air vane. The throttle plate is installed in the air vane shaft inside the carb. The spring should hold the air vane all the way over to the throttle wide open position, and if you move it should snap back under spring tension. The end of the governor spring is connected to the sliding bar on top of the air box which moves with the throttle lever.

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Comments (7)

mort2560
Original Author
15 years ago
Thanks. I didn't know if it held it open or closed. What should it do when the throttle lever is moved? Does it close it? I put it together and when I move the lever, It doesn't seem to do anything....
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1saxman
15 years ago
At the base of the air vane is a knurled disc which is the governor adjustment. Turn this - it will click - I'd turn it about a half turn and see if it affects engine speed. Keep turning and it eventually will. It's just a pre-tensioner for the governor spring. It won't work unless the engine is running. The system depends on the air from the flywheel trying to blow the air vane/throttle shut while the governor spring holds it open. The throttle moves the sliding bar to preset tension on the spring, resulting in changes in RPM.
Kyle Tuller
7 years ago
I just replaced my governor spring with limited knowledge on how to do so. Now that I have everything put back together my mower is exerting random RPM's when I start it. I have adjusted the spring as mentioned, but I can't correct the RPM's. My air vane moves up and down freely while I'm adjusting the wheel below it. Is there supposed to be play between the air vane and the piece it sits on? The diagram I got off of the Toro website showed a pin on top of the air vane. I don't think mine has one, and I'm not sure if that's the problem or if I'm not adjusting the spring right.
1saxman
7 years ago
I wish I could help you on that but I never took one of those apart and I haven't owned a 2-cycle Lawn-Boy in years. I know the end of the coiled governor spring under the adjustment knob at the base of the air vane shaft connects over to the sliding bar on top of the air box. The throttle lever moves the sliding bar which changes the tension on the governor spring, which changes the tension on the air vane shaft. More tension makes the air vane more resistant to being blown over, allowing it to open the throttle more.
robert_t_shore
7 years ago
Kyle Tuller, how did you get the air vane off of the carburetor? That's what I'm trying to do. My governor spring is shot! It has overstretched and isn't properly engaged into the vane for it to function. It overstretched from the carb being serviced.

I don't see any screws or other hardware to remove to get the vane off. Inside the carb where the vane sits with the choke valve it is simply capped off at the end. So somehow it would have to remove from the carburetor at the vane assembly.

Thanks!

Rob
phototone
7 years ago
On the Duraforce plastic carb, you take a pair of needle-nose pliers and just pull out the throttle round disc in the mouth of the carb and the whole top vane assembly will just pull out of the carb. The throttle disc is just held in a slot in the plastic shaft that comes from the vane on top. Its easy.

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