Doms CB550F1 project

[McCabe-Thiele (Ted)]

Had the SS version been available when I assembled my carbs I would have fitted one. I sourced a much better one than my original from a member here.

If the corrosion is just on the sections between the fittings a good clean up & a some silver paint is pretty good - it's hardly vissible when the petrol tank is fitted.

My carbs had been restored by Gerben & when they drilled out the pin they broke part of that bearing - hence why my bracket had to be replaced - if you decide to drill out the pin be very careful as there is a risk of the bush in the bracket splitting in two. The bush looks like some sort of bronze colour.

[DomP]

Thanks Ted, I'm not sure what is meant by the bronze bush, is there any photos on you're build thread?

[McCabe-Thiele (Ted)]

Thanks Ted, I'm not sure what is meant by the bronze bush, is there any photos on you're build thread?

The bracket that the throttle rod runs through has bushes inside the alloy bracket at each end - the bushes are not available seperately. When you drill out the pin on the right side of the bracket there is a risk that the drill will go into the bush & it could split.

Updated Found a photo.

.throttle bracket bush 1 by Macabe Thiele, on Flickr

.broken bush by Macabe Thiele, on Flickr


.

[K2-K6]

If you are going to remove a rusty one to replace it, then worthwhile using emery cloth (the real stuff) on the open rusty bits to allow passing through the bushes with reduced chance of damage.

[Oddjob]

TBH Ted I think it was either Gerben that buggered up that bush or someone before him broke it and he didn't see it until he had them. I think whoever did it didn't drill all of it out, then they started to hit the rod sideways not knowing that a bit was left in, that shattered the bush.

The new Stainless Steel rods are £50 each Dom including P&P. That's not exactly cheap but you can't buy a new rod and getting an old one hard chromed costs around £65-85, I had a couple done earlier this year, the first time I had one done they charged around £25-30, then the power crisis hit and the cost went through the roof. I have some of those dog point screws as well, if you buy one I'll throw in one for you.

ATM, I only have one rod that Max made as the test one, I intend to order 3-4 more in a few weeks. However if you want this one I can let you have it so you can get on with the carbs.

[McCabe-Thiele (Ted)]

If you are going to remove a rusty one to replace it, then worthwhile using emery cloth (the real stuff) on the open rusty bits to allow passing through the bushes with reduced chance of damage.

Good point made K2-K6, I had cleaned off the visible rust on my old shaft with a small brass rotary brush in my drill before I drilled out the pin.  The bracket was inside a large shallow plastic tub that I use for dismantling things like carbs or gearboxes - aside from some waste from drilling out the pin there was no other debris so I am certain it was already broken.

[Laverda Dave]

I took my 400/4 spindle to Philpotts with my fork stanctions and asked how much to hard chrome it........£130😲, I didn't bother!
I've bought a S/S one from Max. He's going to be making them for the 400/4 in the near future.

[Sesman]

Photo required for confirmation, but probably yes. No, you can’t reuse the pin!!!

Yeah, I said what can I use to re-pin.  Here's the photo I meant to upload.

Oops, sorry Dom. must get some new specs. Plus one on what Ken has advised…eg dog point screw.

[Oddjob]

I took my 400/4 spindle to Philpotts with my fork stanctions and asked how much to hard chrome it........£130😲, I didn't bother!
I've bought a S/S one from Max. He's going to be making them for the 400/4 in the near future.

That's odd, was this after I'd asked him to make them Dave as he asked for an old spindle to copy and AFAIK he's only made the one, which I have. Unless of course he made one especially for you.

[DomP]

Thanks everyone for your replies, so once carefully drilled out the pin and the deburred shaft is slid out, drill out and tap to 4 or 5mm leaving the bushes in place?

[Oddjob]

Yeah 4 or 5mm. Not sure which I've got but suspect it's 5mm, I'll have a look.

[McCabe-Thiele (Ted)]

Unless you are replacing the shaft I see little point in removing it unless you need to replate the quadrant.

[Oddjob]

Oh I dunno Ted, some grease on those bushes can't hurt, plus it lets you really inspect some of the parts. I've seen lifter arms cracking where the pin goes through for example, yes you could most likely spot that without dismantling but checking the quadrant is also flat and not twisted is another.

I've considered drilling 2 small holes above the bushes so I can occasionally drop a little silicon oil down there, just 2 small plugs needed to seal them.

Plus of course the ability to change or replate the rod.

[DomP]

Yeah 4 or 5mm. Not sure which I've got but suspect it's 5mm, I'll have a look.

I think for now Ken (and Ted) I'm just going to replate the throttle cable linkages and replace the shaft another time but thanks for the offer.

[Laverdaroo]

Dom, did you get anywhere with the  footpeg scenario? I’ve just come back from the states  and having a read. I think I have a spare one if you want to try it. I had the same issues  with mine and had to doctor the ones that stayed on the bike. How’s you get on?