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surging question

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Rob in NH
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surging question

Postby Rob in NH » 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?
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Buzzard Wing
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Re: surging question

Postby Buzzard Wing » 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.
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)

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RaymondDurban
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Re: surging question

Postby RaymondDurban » 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.

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Re: surging question

Postby ScottyD'sdad » 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
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Rob in NH
10+ Years
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Posts: 2729
Joined: Sun Oct 03, 2004 7:11 am
Zip Code: 03848
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Tractors Owned: 1947 circle cub
1950 cub demonstrator
1957 cub
1967 cub
Circle of Safety: Y
Location: NH, Kingston
Contact:

Re: surging question

Postby Rob in NH » Sun Jan 27, 2013 1:20 pm

it usually surges under load. ok at idle
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Re: surging question

Postby Eugene » 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.
I have an excuse. CRS.

Rob in NH
10+ Years
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Posts: 2729
Joined: Sun Oct 03, 2004 7:11 am
Zip Code: 03848
eBay ID: panelbeata
Tractors Owned: 1947 circle cub
1950 cub demonstrator
1957 cub
1967 cub
Circle of Safety: Y
Location: NH, Kingston
Contact:

Re: surging question

Postby Rob in NH » Sun Jan 27, 2013 3:30 pm

i don't believe its mismatched because it ran well before
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Buzzard Wing
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Re: surging question

Postby Buzzard Wing » 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.
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)


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