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rebuilding carbs

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exvalvesetdabbler:
I have been digging through my boxes of bits and found enough bits to put together a set of carbs.

I'll post what ever I get up to on this thread as I go.

The first job was to refurb the frame and link rod that was stuck fast.  Loads of soaking in various fluids and wiggling to get some movement. Made up a jig to drill out the pin so that the link rod could be extracted.  Then drill out the hole to 4.4 mm and tap M5.

The jig keeps the drill centered.  Drilling out a steel pin from aluminium can result in the drill wandering off centrer.
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Stepped screw to lock in the link rod.
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Remove the felt seals and retainer
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Link rod. This is after 2 days in my electrolytic cleaning bath to de-rust an clean.A bit scabby where the throttle linkage is attached bit at least the bit that engages with the bushes has survived. I'll probably just brush plate this portion.
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Edit.  Be careful not to loose the nylon shim washer that goes on each end of the bronze bush.

Regards
Dave

exvalvesetdabbler:
Time to separate the two halves of the throttle cable rotor.  I learned from previous experience that acids and plating solution can get trapped between the two halves resulting in corrosion creeping out the cracks.

I center punched each rivet and drilled out using a center drill. Any residual around the hole can be sliced off with a sharp blade and the remaining rivet on the other side can simply be pressed out.

A center drill with a tip just under 3mm is an ideal size.
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exvalvesetdabbler:
The original retainer rings for the felt seals weren't that great and it was easier to make some new one out of stainless.

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I will still try to re plate some of the old ones but I suspect that once they have been cleaned and pickled, there won't be much left of them.

Lots of. De rusting and electrolytic cleaning to do. Sodium carbonate, dash of oven cleaner and washing up liquid. It's a slow process but saves on a lot of scrubbing.

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Regards
Dave.

Laverda Dave:
Nice work and well done for putting in so much effort to overcome the problems.
I can see you recieving order for those stainless felt retainers 👍

Murf:
A lot of good ideas there, I like your electrolytic cleaning, will you be replating the parts yourself?

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