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rebuilding carbs

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exvalvesetdabbler:
Jury is still out on plating,  depends if I can get a worthwhile batch together to send them out. Also there's a lot of small bits to loose.   If I do them myself, I need to  refine the brighteners in my tank to get a level finish, and probably try out an alkaline bath for better throwing power to get into all the nooks and crannies.

Regards
Dave

exvalvesetdabbler:
Most bits cleaned, rust removed.  This is the state I would have them before sending off to the platers or plating myself. Flash rusting shouldn't be a concern so long as some residual plate remains. That's the beauty of this clean up method, it removes rust but leaves zinc plate in place.

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Regards
Dave

exvalvesetdabbler:
Nickel plating the ends of the carb link rod.  These are quite a soft steel that has been hard chromed and since it's only the end bits that are the worst and in plain sight once on the bike, I decided to clean those up and apply a coat of nickel.

Because of the inverted cone on each end, simply dipping the end in plating solution just trapped bubbles and didn't cover well.  I came up with this method using a cable gland to create a cell around the end.  The bit above the gland is the nickel anode.

Slow going at 10-15 mA but it seems to be working.

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Regards
Dave

exvalvesetdabbler:
I had a, little win today, been figuring out how to cut the felt seals while keeping the od and id concentric. Cutting the two holes separately was not reliable.

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The solution was to make the two cutters fit inside each other. The outer cutter does the outside diameter and retains the circle of felt.  The inner cutter is chamfered internally to cut the inner hole to the size needed.

These are cut by squeezing the cutter against hard plastic in the bench vice so no bruised knuckles which is a bonus.

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This is the felt that I found.

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Just need to do the same for the carbs link rod and the throttle slide arm felts.

Bit of a faff making up tooling but should be able to turn them out like sausages.  I was tempted to size the cutters to the same length so that a felt washer comes out in one hit, maybe later

Regards
Dave

exvalvesetdabbler:
Been making replacement interconnectors to replace the old plastic ones that some folk have been reporting breakages for.   I also compared the measurements with the T connector which is brass. On the old plastic ones, the groove width was narrower as was it's inner diameter. Not really sure if the old plastic has shrunk with age or just naff machining tolerances.  I made the new ones to match the grooves in the T connector.

A bit of faffing around grinding a groove tool for machining brass to reduce the rake angle to near zero, a sharp contrast to what I have been using for stainless.  The tool tip was honed on an oil stone to remove grinding marks that would otherwise show up on the finish of the groove.

Nearly finished after deburring
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Finished item
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Don't think I could make a living doing these, the first one has taken most of the day in between the crisp, biscuits and coffee breaks, on the plus side there were no rejects. 

Number two tomorrow.

Regards
Dave

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