SOHC.co.uk Forums > CB500/550

Carb return spring on '77 CB550F

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Oddjob:
The return spring on those carbs is very strong, too strong, some would say. Remove the spring and move the butterfly by hand, if smooth it’s the spring if not then it’s something like a bent needle for instance

Johnwebley:
Does it have a "closer " cable?

And will that fully close the carbs

Sent from my SM-A546E using Tapatalk

McCabe-Thiele (Ted):
If you press down on one of the 4 brass caps in the linkage does that shut the throttle?

Might be worth checking each in turn ?

Bryanj:
The shaft i mean is the one that runs accross the mounting bracket and is not available seperate nor the bushes in the bracket that the shaft turns in.

If somebody in the past has tried to remove the shaft without drilling out the locking pins it damages the bushes

alexdecker:
Thanks for all the replies guys!

 The carbs does have a "push" cable, and when I reverse throttle, the carb closes all the way. Also when I push the brass caps, the carb closes all the way. Also, I hope its not the shaft and bushings. This is a fairly new problem, and last season, the carbs closed fine (after I restored them), but this season all of a sudden they are hanging a bit.

I will test the spring as Oddjob is suggesting and go from there. Update will follow.

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