45 GM governor acts erratic

[grniron58]

The governor on my GM gallops at medium to full throttle when in 4th, 5th, and 6th gears under no load. The backlash on governor and fan gear are correct. Any ideas what is causing this? Can the weights being sloppy cause this? Any ideas would be of great help.

 

[Husker44A]

Good plugs, wires, ignition parts? Good clean carb? Carb adjusted properly? Good gas? Yes weights can make it gallop if worn. Check the obvious first. Cheaper too.

 

[grniron58]

All ignition parts replaced or good, mag rebuilt, carb rebuilt, new gas. It will idle down to were the impulse on mag inguages. I did put on dyno and I notice that the throttle valve on carb really works back and forth from lite load up to right before dead load. If I hold carb steady it seems to run at a steady pull.

If weights are sloppy will weights from an A work or do I need G weights?

 

[Anonymous-0]

Binding in the governor to carb linkage can cause this, the rod being too short can also make it over react. At slow speeds it's easy to make both A's and G's violently go from WOT for one cycle then totally shut down (the carb) for the next cycle then back to WOT for the next. Rarely does this happen over 1/2 speed unless the throttle plate/shaft is binding. It should rotate effortlessly.

I know you said the gear train lash is right but.... A loose governor shaft (right shaft bearing outer race being stuck) usually causes throttle flutter when running but MAY be your problem or an aggravation of several small problems all piling up. I'd first remove the mag and check the governor shaft for side to side play by pushing and puling on it. There should be zero! Then set the length of the throttle rod between the governor and the carb. If he's jumpy, making this rod a bit long calms them down. Make sure the throttle rotates in it's bore absolutely effortlessly. I've seen some bind just from the machining of the slot in a replacement throttle shaft being too wide for the thickness of the plate causing a slight bend to the shaft when thghtened up. Have had to shim after markets to solve that problem.

Lotta could be's in there!