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Carb return spring on '77 CB550F

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alexdecker:
Hey all

I got a throttle that is not returning fully. I inspected cables, throttle pipe etc. all with no problems. When I disconnect the cables from the carb, the carb still doesn't return fully to the idle screw stop. This makes me think that the return spring is the problem. If I open the throttle fully, it will snap fully back. But if I only open it 1/3, it will not snap all the way back.

My question is: Is there anything else that could cause this? Is there some screw I can have tightened too much in the carb rebuild, that will hinder the spring in doing its work? Could something else bind, or maybe a third thing? Most people on the forums says that its very unlikely that the spring is faulty. Although it does seem like that would be the exact problem in this case, I just wanna make sure there is nothing else Im missing, before I go looking for a replacement.

- Alex

Bryanj:
More likely the shaft is tight in the bushings

Robert W:
Did you re-synchronize the carbs with the idle adjustment screw turned in a lot? This will affect the carbs returning to the stop screw when the spring return doesn't have enough snap to go into the over ride.

alexdecker:

--- Quote from: Bryanj on September 11, 2025, 01:37:36 PM ---More likely the shaft is tight in the bushings

--- End quote ---

Can you put a few more words on it? Was looking at the parts lists on CMS, but not completely sure what parts you are talking about.

alexdecker:

--- Quote from: Robert W on September 11, 2025, 03:36:27 PM ---Did you re-synchronize the carbs with the idle adjustment screw turned in a lot? This will affect the carbs returning to the stop screw when the spring return doesn't have enough snap to go into the over ride.

--- End quote ---

I didn't, and it sits in a really nice spot. Wish it was that simple though - would make for less of a headache :)

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