Topic: Removing throttle linkage rod from carb rack (CB550)

[bistromath]

Hi all,

I'm pulling apart my carb rack because I don't know what's good for me and I enjoy pain. Also, I want to degrease them and replace the old, hardened fuel lines and inter-carb O-rings. Separating the four carbs from the rack was easy enough, but I'd also like to remove the throttle return spring, butterfly, and linkages from the throttle pivot rod. Unfortunately, I can't seem to figure out how this is done. It almost looks as though the pivot is peened into place using a pin -- is this actually the case? Is there a way to pull it out?

Here's a photo of what I'm talking about, since terminology is always confusing.



Thanks,
Nick

[Deltarider]

I'm pulling apart my carb rack

Don't.

Also, I want to degrease them

They will be greasy again in no time.

and replace the old, hardened fuel lines

Can be done with carbs in situ.

and inter-carb O-rings.

Mine are in there for 40 years and still don't leak in spite of being treated badly by me.

but I'd also like to remove the throttle return spring, butterfly, and linkages from the throttle pivot rod. Unfortunately, I can't seem to figure out how this is done. It almost looks as though the pivot is peened into place using a pin -- is this actually the case?

Why? Oh and sorry I can't help.

[harisuluv]

You are correct it is held in place by a pressed in pin that fits into a corresponding groove in the rod. 

Unless your linkage is broken, there is almost nothing to gain from pursuing taking it apart.  In fact, there is a lot of damage that couldn't be practically fixed if you don't know what you're doing.

Lots of carbs throttle assemblies are ruined by people trying to do that.

[bistromath]

Welp, the people have spoken. I'll clean as best I can in situ and reassemble. Thanks guys.

[ClawSS]

You are correct it is held in place by a pressed in pin that fits into a corresponding groove in the rod. 

Unless your linkage is broken, there is almost nothing to gain from pursuing taking it apart.  In fact, there is a lot of damage that couldn't be practically fixed if you don't know what you're doing.

Lots of carbs throttle assemblies are ruined by people trying to do that.

I’m the guy with the broken throttle linkage who wants to know what he’s doing, anyone know how? 😅

[newday777]

You are correct it is held in place by a pressed in pin that fits into a corresponding groove in the rod. 

Unless your linkage is broken, there is almost nothing to gain from pursuing taking it apart.  In fact, there is a lot of damage that couldn't be practically fixed if you don't know what you're doing.

Lots of carbs throttle assemblies are ruined by people trying to do that.

I’m the guy with the broken throttle linkage who wants to know what he’s doing, anyone know how? 😅

Does your rack have a pin like this? What year is your bike?

[ClawSS]

1976 cb550f with 069A carbs. I can’t tell without mine in front of me but it looks identical to OP’s initial photo


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[Deltarider]

Best videos on this subject are by Marco in Germany. He has filmed the complete process with Deutsche Gründlichkeit. He is modest, does not raise his voice, does not brag and does not show off. His videos are a relief, really Zen and a joy to watch. He is the best. No detail is left out. Watch them and, when needed, opt for translation in English.
You will find all his videos on disassembly as well as assembly here: the first of his serie is:

Enjoy!
I have doubted years before directing you to his work. I am of the opinion that CB500/550 carbs do not need to be separated from the rack ever.
He has made a similar serie of videos about the CB350F carbs.

[ClawSS]

I am of the opinion that CB500/550 carbs do not need to be separated from the rack ever.
He has made a similar serie of videos about the CB350F carbs.

I understand, my throttle cable channel and spring are broken beyond repair and must be replaced. Thank you for the video!


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