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new carb


 
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rb221
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Joined: 16 Jun 2021
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PostPosted: Wed Jun 16, 2021 7:25 am    Post subject: new carb Reply to specific post Reply with quote

Just put a new Zenith carb on a 64 550 Oliver. Can't control rpm's to high or get the govenor to work properly, anyone has any tips thanks
 
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old
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Location: Lake of the Ozarks area of MO

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PostPosted: Wed Jun 16, 2021 7:48 am    Post subject: Re: new carb Reply to specific post Reply with quote

Linkage correct and not binding. Can you control RPM by grabbing the linkage between the carb and gov??
 
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rb221
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PostPosted: Wed Jun 16, 2021 8:15 am    Post subject: Re: new carb Reply to specific post Reply with quote

CVPost-old wrote:
(quoted from post at 11:48:02 06/16/21) Linkage correct and not binding. Can you control RPM by grabbing the linkage between the carb and gov??
linkage is not binding and yes can control rpm's by grabbing linkage, have tried adjusting the govenor but doesn't seem to help
 
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rb221
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PostPosted: Wed Jun 16, 2021 8:27 am    Post subject: Re: new carb Reply to specific post Reply with quote

I used the same linkage for the old carb just had to add an extra piece that came with the new carb in order to get it to open and close the throttle on the new carb. it pulls on the governor almost immediately can't adjust it to not pull on governor arm immediately. any suggestions?
 
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Steve@Advance
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PostPosted: Wed Jun 16, 2021 9:38 am    Post subject: Re: new carb Reply to specific post Reply with quote

If the old carb worked as it should by the governor, then there is some difference in the geometry of the linkage.

Compare the old with the new carefully. The length of the arm, from the center of the throttle shaft to the center of the linkage hole must be the same. The angle of the arm must be the same where it clamps to the throttle shaft.

With the engine off, dash lever at idle, the throttle should be held against the idle stop screw. With the engine off, dash lever at fast, the throttle should be spring loaded to full open.

Just speaking generically, but the typical problem is the governor runs out of travel before the throttle is pushed closed. Even though the linkage still reaches, the governor has a limited amount of throw internally.

The function of the governor is adjusted by the length of the rod, the governed speed is adjusted by the tension applied to the governor spring.

Theory behind any governor, the throttle spring tries to open the throttle, the spinning governor weights try to push it back closed.

Hope this helps.
 
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rb221
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PostPosted: Thu Jun 17, 2021 3:13 am    Post subject: Re: new carb Reply to specific post Reply with quote


yes thanks for the help
 
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gable
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PostPosted: Thu Jun 24, 2021 2:57 pm    Post subject: Re: new carb Reply to specific post Reply with quote

Update us with the trick that works.
 
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