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Attempted to label components. The diagram above showing what you have labeled the "traditional system" requires a comment or two.

First, there are two butterfly valves. One for the throttle which is metal and inboard of the second for the choke which is made of black plastic.

The diagram indicates two linkages from the governor arm. One is a spring, the second is a sturdy length of wire both ending with a connection to the throttle butterfly valve. Now take a look at your return pic to me, the one with the yellow square.

Notice the heavier wire is not connected directly to the throttle butterfly valve. Only the spring is connected to the TBV. This set up is contrary to the "traditional system" diagram. Part of the reason is that the manual choke activator is actually part of another mechanism controlled by a cable running up the the dead man's bail on the handle. To start a cold motor, the mechanical choke is set "on" by pulling it rearward to the stop. This physically positions the clutch butterfly valve open by mechanical linkage(see red circle). Closing the bail allows the motor to start when the lanyard is pulled. As the motor warms, the choke mechanism automatically closes as long as the bail in held closed. Once the motor is warm and the choke has closed, the spring loaded governor arm is now in play to allow for constant rpm under varying load.

I can find no adjustment for idle rpm which leads me to the governor set up, which has been suggested as the way to adjust the engine rpm. On your dia "traditional system" there shows a lock nut holding the governor arm in place which when loosened allows for the governor adjustment shaft to be rotated to control rpm. Anti-clockwise is supposed to reduce rpm, clockwise is supposed to increase rpm. I have tried this, but could not budge the governor adjustment shaft anti-clockwise.


Therein lies my issue. Perhaps I didn't use enough oooomph in turning that shaft. I don't know. Anyway that's my two cent contribution to this qusst.

Centexn