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I suspect Ken is right about the quality of Gerben work look at my 500 carbs!

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Bryanj:
Those carbs were exactly as i recieved them from Gerben including hose, i must admit to not being impressed with the hose but having paid a lot i fitted as is.
Now have my own ultrasonic in partnership with my mate and only worry aboutairway/jetway clealiness as i dont do restore but rebuild for use

Oddjob:
The pipe I used is also 5.5mm ID Skoti, I like the fact it needs to stretch over the T pieces etc as you know it's secure that way. Nothing worse than blowing one off when the engines running. It went on very easily I may add, no real force needed. I used clips because the pipes were lubed with silicon oil to allow them to go on easily and fully.

The fuel pipe clip I made out of some old alloy sheet and then shrink wrapped with some heavy duty pre glued shrink wrap so it didn't cut the pipe.

A lot of the bolts and screws are stainless, the others are brand new JIS screws. I tend not to re-use screws unless they are unique.

McCabe-Thiele (Ted):
My Ultrasound Unit is still working (touch wood) so no problem for me to re-clean everything Bryan.

The main throttle shaft dismantling will be new territory for me  so I will take  loads of photos so that the centre spring fits back on as it should.

I am not much good at riveting except with pop rivets so more learning ahead for me.

Oddjob:
Not sure how you are going to repair that linkage bar Ted, Graham reckons they are hard chromed but hard chrome doesn't flake like that. I suspect satin chrome, like decorative but not as bright.

Inside the 2 towers that support the linkage bar are some bronze or brass bushes, make sure they are ok. Re-assemble with some silicon oil or grease and when re-inserting the rivet or screw used to stop the bar coming out make sure the bar can spin freely, easy to nip it up and make the mechanism bind. I did consider drilling a couple of small holes in the top of the towers so I could periodically drop some oil down into the bushes but decided against it, might do it on my own set though, just cap them off with some screws etc to stop dirt gaining access. I'm not 100% sure but I suspect the butterfly on yours is twisted, once the carbs are off check it before removing to see. A quick spin should show if it's buckled. I have a spare somewhere if it's junk.

The mechanism looks complicated but TBH it's pretty simple once it comes apart.

The return spring on those carbs was from DS, it proved to be too weak to return the carbs properly and we nicked an original spring off another bank and fitted that using a 5mm stainless steel split ring on the bottom pin to reduce the pull of the spring, hence why you can see the spring weight in some of the pics, I was measuring how strong the springs were in comparison. IIRC the OE spring has a 12lb pull, with a 5mm split ring used it's only 8lbs. As we get older and the wrists start to weaken that reduction could help a lot

Forgot to mention the carb bracket, the main one, has been ceramic coated in silver rather than sprayed with silver paint, it's resistant to most things so should last as long as the hard chromed rod it's fitted with. I had 3 done at the same time, one satin black, one silver and one done in a sort of chrome finish. Just wanted to see how they looked before using them. Not sure yet what colour my bracket will be. Just bought a set of CB550 069A carbs so I have another rod and bracket to restore unless I break them for spares.

Bryanj:
Ted, i will have a look in my "spares" and see if i have a better mounting plate/shaft to swop for you, no guarantees tho'

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