Farmall Cub Forum -- Questions and answers to all of your Cub related issues.
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Sun Jan 27, 2013 12:25 pm
i adjusted the carb adjustment but it still surges a bit. is there something on the governor that i can adjust?
Sun Jan 27, 2013 12:37 pm
I will offer the simple fix.... clean the jet with a piece of phone wire.
If it seems to be OK at an idle or with 1/2 choke, it is pretty often a chunk of something is restricting the fuel flow.
After that there is an adjustment on the governor. I am not too wise about it, but it's in the service manual.
Sun Jan 27, 2013 12:40 pm
Is it surging at all throttle settings, or just at idle?
The bumper spring on the governor can be turned in, but if you turn it in too far, it will affect low idle RPM's.
Sun Jan 27, 2013 12:44 pm
Rob, is this a new problem? If its old, it could be mismatched parts in the carb.. Ed
Sun Jan 27, 2013 1:20 pm
it usually surges under load. ok at idle
Sun Jan 27, 2013 1:35 pm
Rob in NH wrote:it usually surges under load. ok at idle
ScottyD'sdad wrote:Rob, is this a new problem? If its old, it could be mismatched parts in the carb.. Ed
Long time problem? Could be fuel flow, low fuel level in carburetor bowl, or partially plugged main jet. New problem, partially plugged main jet.
Sun Jan 27, 2013 3:30 pm
i don't believe its mismatched because it ran well before
Sun Jan 27, 2013 4:18 pm
I vote for the main jet..... Can't hurt to clean the strainer, fuel bowl too.
Shut the fuel off, 3/8" wrench, let it drain as you pull the jet out (brass/bronze 'nut' on the side of the carb).
You can just blow it out too.... but a thin piece of soft wire works well.
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