JAP 5 Governor

This photo from pre-restoration shows that the Spring adjustment assembly on the governor is missing. The throttle lever is cable tied to the governor arm.

This photo , post restoration shows that the missing governor screw assembly was not addressed. Note the new throttle cable fitted.

For start up and engine idling, the operation of the governor is not important. However , with the governor working correctly and set at 2000rpm , regardless of full throttle input from the handlebar throttle lever , the max revs that the engine will do is 2000 rpm. In this case it prevents the engine from over speeding and possible serious damage. It is not really a good idea to run the engine without the governor working correctly.

When the engine experiences variable loads, the governor automatically compensates the throttle to maintain the set desired speed. The governor senses any variance in the engine speed from what the handlebar throttle lever requested and alters the throttle input at the carbreuttor to correct the engine speed. This is a particularly important feature to have working correctly when ploughing.

The photos above show my governor assembly, as is alongside a complete governor assembly on another Anzani Iron Horse. The governor on mine isn’t operational and has the throttle arm cable tied to the governor arm with a throttle spring attached to the carb throttle lever. The other tractor has a long throttle spring attached to the throttle arm. The governor screw assembly sets the max allowable engine speed. On mine , the complete governor screw and spring assembly are broken off the governor end plate.

When Mick Green came over to the Meath and Dublin ploughing matches in March, he brought me a replacement governor end cap and spring assembly. I have removed the end cap on mine to fit the complete one , but the internal governor assembly does not look correct. I will have to investigate further.

When I removed the governor end cap , I took this photo. I should see the centre governor actuator , as in the exploded view sketch ?? Could it be assembled the wrong way around ? Will have to investigate further.

Here is a photo from Barry Barrington’s FB post re “loosing a couple of front teeth” You can see the governor assembly and the center hole trough which the actuator moves in / out. Looks like mine is installed incorrectly.

Here I have removed the block piece that was fastened between both sides, by removing the 2 split pins, You can now see the center hole into which the actuator will fit. I now just have to find a pair of weights to install.

Here is the block piece (that spurious extra part ? ) that I have removed. I wonder where did this originate ? Could it be a correct part for for a different configuration of engine governing ?

The tapered pin holding the gear in situ , is removed , first by tapping thru with a punch and then turning that gear almost 180 degrees to pull the pin back out thru the hole in the casing.

The Gear will then easily pull off the shaft and the shaft can be pulled out fordwards.

View of front and back of the housing with the gear and shaft assembly removed.

Governor gear and shaft assembly removed. The governor actuator rod is inserted into the center hole in the shaft, but that hole appears to be too shallow to fully accept the governor rod. That shaft appears to be an incorrect part for this type of governor configuration.