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rebuilding carbs
ST1100:
--- Quote from: AshimotoK0 on February 24, 2026, 11:15:08 PM ---This is exactly the same as mine 1970s Emcomat 7 with milling head. It was made in Austria...
--- End quote ---
Indeed 8)
We had an Emco 8 in the company I spent my apprenticeship (electromechanics and mechanical engineering) at, very versatile machine... (back in the day we still repaired things instead of replacing...)
Got me a small Erba Compact 300 for the bike shed, perfect for small items and still light enough to carry and store away in the shelf when not in use.
Don't need it often, but when, you're in dire need to have that little lathe at hand...
exvalvesetdabbler:
My biggest regret was not buying the milling head to go with my little lathe. It's been worked hard over the last 40 years and has a few faults now. Originally sold as a model makers lathe. It's earned its keep and doesn't really owe me anything if it falls apart tomorrow.
If you tot up the cost of bits made, it's paid for itself with all the screw cutting and machining.
Wheel spacers, collars, main stand pivot, side stand pivot bolt, engine mounting bolts, caliper bolts, some in high tensile stainless which was pushing things it a bit.
Most useful tool next to the lump hammer and mole grips!
Regards
Dave
exvalvesetdabbler:
I picked up the carb bodies from the vapour blasters today, they came out as good as expected. here are a few pits remaining , but they can't put metal back on! Bit of a balance between smothing out a few deep pits and not rounding off the sharp edges on the lettering/ keihin logo
Currently removing all the blanking plugs and giving them a buzz in the ultrasonic followed by drying off and a light spray with duck oil to preserve them for now. It will be a few months before I can get the plating done.
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I haven't been slacking though, fuel tap body cleaned up and the brass nut nickel plated
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Regards
Dave
exvalvesetdabbler:
Making a start on the electroplating. A few test pieces I put through yesterday evening. This is my first time using commercial carriers and brighteners.
This is using the Gateros chemicals. I only put 4ml of brightener in rather than 6 ml as per the instructions hoping for a less shiny finish hoping that would give better adhesion for the yellow passivate. (Which a lot of folk have problems with). I will have to push through some more clear passivate items first to use up some more brightener.
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So far I am degreasing and stripping old plate off using a sodium hydroxide based sink unblocker in the ultrasonic bath followed by warm citric acid until there's no more fizzing. If they are then clean enough (water break test).just a minute in 5% HCl rinse and straight into the bath. A few bits where rust is visible in any pitting, just back into the acid till it's gone.
Prior to passivation, 5 minutes in the ultrasonic using warm soapy water to scrub any residual brighteners from the surface followed by an acid dip.
Regards
Dave
Johnny4428:
Looks like you are getting good results there. Nice work!
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