SOHC.co.uk Forums > CB750
750 K2 Strip & Rebuild - help please
Lobo:
Have some surplus VHT Silver paint, originally destined for the CB750 rebuild but not used. It boasts 1000+ C, and mentions exhaust systems etc. Q. How would it perform on non-hot components - specifically the carb on the old Kombi; which is out & in bits, so might as well get a bit of love…
smoothoperator:
The VHT paint seems pretty tough stuff to me, but that is after curing in the oven. So if you are confident to put whatever part in the oven for an hour or so, I would say it would be worth a shot, even if that part never saw 150 C again. Maybe it would be a bit soft if it wasn't cured, and obviously you are looking for petrol resistance if you are painting a carb.
K2-K6:
--- Quote from: Lobo on May 31, 2022, 11:10:19 PM ---Have some surplus VHT Silver paint, originally destined for the CB750 rebuild but not used. It boasts 1000+ C, and mentions exhaust systems etc. Q. How would it perform on non-hot components - specifically the carb on the old Kombi; which is out & in bits, so might as well get a bit of love…
--- End quote ---
Unsure of predicting an outcome because of zinc-ee base material. Painted carburettor are few and far between and maybe because of this element, unable to competently adhere to zinc prominent metals. It's decomposition being a protective strategy with micro surface conversion to zinc oxide (I believe) giving this characteristic, a little like self anodizing in effect.
Doubt if it will cause any difficulty, but may not be longer term permanent because of above reason. The paint should survive but may not be attached sufficiently to the casting to avoid bits falling away.
For zinc surface consider it like painting/priming galvanised items, so maybe a competent base layer would assist here.
Oddjob:
I've never had a problem getting paint to stick to carb bodies Nigel, the linkages though are another problem.
My current 500 restoration features sprayed carb bodies with petrol resistant lacquer on the spray paint.
Lobo:
Kombi carb body painted and baked @ 200C / 1 hr. Other bits plated. Annoyed at myself for not dressing the screws < plating; will do better next time 🙁
Thanks for the helpful comments…
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