Posted by wore out on June 30, 2021 at 07:54:03 from (64.255.159.199):
In Reply to: Super M hunting posted by davidroller on June 29, 2021 at 19:41:44:
Quoting Removed, click Modern View to see
Has it ever run right since you've had it?
Unless something is BADLY worn in the governor or linkage to the carb the "hunting" is most likely cause by a carburetor issue.
Under no load or light load, as the engine speed "catches up" with the governor setting the governor closes the throttle butterfly enough that the "load circuit" stops (or lessens) the flow of fuel and the "idle circuit" has to flow enough to make up for that.
When the engine slows a bit and the governor opens the throttle butterfly a bit the "load circuit" takes over again.
"Hunting" is the result of that transferring back and forth between the "idle" and "load" circuits not working as it's supposed to.
Some carbs (not sure about yours) have a "transfer circuit" and/or a "transfer passage" in the throttle bore next to where the butterfly is just above idle.
If the throttle shaft is loose in the carb body or if the throttle plate is not centered in the bore before it's attaching screws are tightened those can be contributing factors as they can affect the flow past the idle and/or transfer ports in the throttle bore.
Also, as I originally asked, has it ever run well since you've had it?
If NOT someone could have previously installed jets that are incorrect for this particular application.
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