Honda-SOHC
SOHC.co.uk Forums => Anorak's Corner => Topic started by: AshimotoK0 on June 29, 2024, 10:01:00 PM
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I took member jojotut's CB750K0 carbs to Prestige Plating to get them to strip all of the plating as a PO had chrome plated them and the mounting bar as well.
It was bit scary handing them over as I didn't quite know what state they would be in after reverse plating but pretty pleased with how they turned out for Steve. Sadly they had been triple plated and reverse plating doesn't remove the copper but I tried treating a carb body in the all important 'Keihin' logo area and managed to buff off the copper and get a decent finish. OK they will never regain their original iridescent sheen but most 50 odd year old carbs lost that years ago anyway.
A lot of work still to do though but with carb sets costing around 500 quid a pop .. well worth saving.
Loads of doom and gloom Facebook keyboard warriors predicted disaster but that'l show 'em.
Prestige reckons that whoever had them chromed must have spent an absolute fortune getting them done.
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Interesting to find out this sort of process Ash.
Something that maybe of interest, photographic fix will strip copper chemically, obviously it's fortè is silver, Ag, but pretty effective in "consuming" copper based too.
Could be worth a test with sacrificial damaged component to assess on carb base metal in cautious approach and find any risk.
It would be C41 film fix to try it.
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Interesting to find out this sort of process Ash.
Something that maybe of interest, photographic fix will strip copper chemically, obviously it's fortè is silver, Ag, but pretty effective in "consuming" copper based too.
Could be worth a test with sacrificial damaged component to assess on carb base metal in cautious approach and find any risk.
It would be C41 film fix to try it.
Interesting Nigel ... I did read that a mixture of Ammonia & Hydrogen Peroxide can be used ... problem is they are not my own parts and I would deffo have to experiment with a scrap part first.
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Don’t know what the chemicals are but what about the stuff that etches the copper to make pcb’s.
Did it many years ago in my electronics lessons at school.
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Don’t know what the chemicals are but what about the stuff that etches the copper to make pcb’s.
Did it many years ago in my electronics lessons at school.
That's ferric chloride Steve ( have 5litres at work for making PCB's as you say)... It attacks alloy I think but could give it a try. I have also used sodium persulphate for etching PCB's
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Managed to bring one of JoJo's 750K0 carbs up to scratch. I have bead blasted the rest of his parts but the other three are down to him to polish now as I need to crack on with my own stuff. Proves you can remove the chrome and recover them to a decent standard...one in the eye for all of the Social Media Facebook experts who said I was wasting my time. Still a hint of copper but that should buff off.
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Good job! 👍
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Impressive Ash.👍👍👍
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Steve (JojoTut on here) who's carbs they are asked what I used after Prestige stripped the chrome and nickel but not all of the copper.
This is what I used to remove the remaining copper plating & give it a rough polish. Started out as 6 squares of el-cheapo green Scotchbrite on the arbor that you usually mount polishing mops on. Very forgiving and gets into the nooks & crannies really effectively. No need to cut out circles, they end up circular fairly quickly anyway and the setup lasts for ages before they wear down too small to use effectively. Polishing motor came out of the skip at work after we got flooded in 2013. It just needed new bearings.
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Great job Ash! Like the idea of the scotchbrite squares, these mops are costly and don’t last long!
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Another great Ash invention hot on the heals of the microwave dent remover :D.
Well done Ash, cracking result I bet Mr Honda would have like to have seen the originals like those!
Now......back to the RSA ;)
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Microwave dent removal???
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Another great Ash invention hot on the heals of the microwave dent remover :D.
Well done Ash, cracking result I bet Mr Honda would have like to have seen the originals like those!
Now......back to the RSA ;)
RSA project stalled at the 'mo Dave until I know the EXACT positioning of the centre section on the petrol tank. I wonder if DS has one in his museum?
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Microwave dent removal???
See Ash’s post: https://www.sohc.co.uk/index.php/topic,31399.0.html
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Another great Ash invention hot on the heals of the microwave dent remover :D.
Well done Ash, cracking result I bet Mr Honda would have like to have seen the originals like those!
Now......back to the RSA ;)
RSA project stalled at the 'mo Dave until I know the EXACT positioning of the centre section on the petrol tank. I wonder if DS has one in his museum?
I'm 99% sure he has one Ash. I offered my RSA to David Silver for his museum and was told they already had one.
Maybe if you call them and ask for Charles Cheshire he might measure their tank for you?
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I'm 99% sure he has one Ash. I offered my RSA to David Silver for his museum and was told they already had one.
Maybe if you call them and ask for Charles Cheshire he might measure their tank for you?
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He's evidently got a red one Dave according to his lists. I will be going to his 400 event ... maybe that's the time.
Seem to remember he got his SS50 from someone on here ... was that you?
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Definitely not me Ash. I never had a moped but went straight to a CB160 at 17👍
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Definitely not me Ash. I never had a moped but went straight to a CB160 at 17👍
Ha ha ..I started on a C200 90cc sports then quicky to a CD175A sloper that I passed my test on. Had a CB160 but never really got on with it.
I seem to remember that a member here had a lovely SS50 moped and sold it to possibly James May and it ended up in DS museum. Could be wrong though :-[
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I'll admit to having owned and used daily two mopeds when I was 16 yrs of age to get to college where I was studying for O levels.
Both were NSU Quickly models iirc my first was two speed (cost £10 a runner from Bob Minions when they were on Park St, Derby) the later one was a three speed both handlebar operated gears.
At weekends I used to do the Matlock Pilgrimage run to look at proper bikes!
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Thanks for the positive comments on this and the microwave transformer spot-welder. Always encouraging when members spur you on.
JoJo (Steve) is going to be a way for a few weeks...so agreed to rough polish the other three carbs for him. Then I will send a pic to 'Miss Diane' ;D at Prestige Electroplating, as she was the one who encouraged us that the carbs could be recovered successfully.
Left my mate 'Dodgy Roger' playing with his home-made vapour blaster yesterday. He was using a submersible pump to pump the water/glass slurry.... . I doubt that the pump is up to the job and will wear out in no time but always great to see people 'have a go' and hope I am proved wrong. He's got it in a nice cabinet though made of stainless steel with a pneumatically controlled top opening cover. Will post some pics on here. It definitely needs a windscreen wiper adding to the inspection window though.
Anyone elso had a go at a DIY vapour blaster?
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Not quite all home made - my BiL has a small Powder Coating arrangement consisting initially of an old fan oven unit out of a fitted kitchen plus the spray gun and electric thing that provides the charge. He uses it to powder coat small items.
Last time I spoke to him he was thinking of using a tall metal filing cabinet case and transfering the oven elements into the cabinet so he could coat larger bike parts including doubling up on the heating elements. As he is looking to move house I think the larger unit is presently on hold as he has been selling some of his bike collection in part to make the move easier.
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Just wanted to thank Ash on his help with these K0 carbs. I would have just tried to source some replacements after initial comments received.
He won't finish off the rest of the bike though! some people are so selfish.
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Blinged JoJo's carbs up a bit more plus my Bomber CB450 14C carbs. Will leave Steve to do the final finishing but a result in my book.
Funnily enough the only K0 carbs on UK eBay were £450 and the same seller just bought my 400 tank off my wife !
https://www.ebay.co.uk/itm/176567153532
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