Posted by Steve@Advance on August 20, 2014 at 21:30:44 from (107.203.134.67):
In Reply to: 50 model fordson dextra posted by Ethan Mckeehan on August 20, 2014 at 19:51:56:
Something is up with the governor.
First, look at the linkage. The governor arm should be linked directly to the carb throttle lever.
Second, the lever on the dash, (the speed control lever) is connected to the governor arm with a spring. At idle, the spring is in the relaxed position. When the lever is pushed to the fast position, the spring is pulled tighter.
Inside the governor housing are a set of weights. The faster the engine runs, the faster the weights spin, the harder the arm pushes against the spring and wants to close the throttle.
So, the spring from the dash lever wants to pull the throttle open, the weights in the governor want to push it closed. With the engine running. there is a balancing act between the two forces that control the engine speed.
Start with the engine off, dash lever at idle. The throttle plate will be open or partially open, and can be pushed closed with minimal effort. The governor arm should travel freely the full range from throttle closed to wide open without binding or having excess slack or wear in any component.
Now move the dash lever to the fast position. The throttle should be spring loaded to the wide open position. You should be able to push it closed with moderate finger pressure, then it will spring back to full open when released.
If everything checks out, set the throttle at idle and start the engine. If it still over revs and the governor does not push the throttle closed, either something is wrong internally with the governor, or the linkage between the gov and carb is too short, running out of travel before the throttle is closed.
Once everything is adjusted and working properly the engine RPM should be 2000-2200.
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