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what bike does this belong on?

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K2-K6:

--- Quote from: Athame57 on October 27, 2025, 07:38:54 PM ---What is that green paint I keep seeing on the back of clocks?  ???

--- End quote ---

This may help, as I've seen it on other environment with instrument installations too

"Common types of green paint and associated risks
Zinc chromate primer: This was widely used on metals like aluminum, steel, and magnesium for its excellent anti-corrosive properties. It was applied to the inside of vintage electronics, aerospace, and military equipment. The green color is a key characteristic.
Health risk: Chromates are known carcinogens and can cause skin and lung irritation.
Lead arsenate paints: This is a rarer but more dangerous possibility. Scheele's Green, a pigment containing copper arsenite, was notoriously used in paints and wallpaper during the Victorian era. Its use in electronics would be a serious health hazard.
Health risk: Arsenic is highly toxic, and its flakes or dust can be inhaled or ingested, leading to a host of health problems"

Whether its has any "degausing" attribute too in these situations may be to keep cases from causing issue with spinning magnet etc, I'd not know.

TrickyMicky:
A stab in the dark?  This is on a CB350 K series.

exvalvesetdabbler:
Start of the red line matches.

Dave.

exvalvesetdabbler:
The green paint seems like oil based gloss paint,  it's probably to keep moisture out the crevice between the alloy bush housing and the steel of the base and inner frame in conjunction with the greasy paper gadget inside. Same with the aluminium rivets going through the steel base and lamp shields.

Seems to tie in with fogging of the glass in cold humid conditions and that later versions have two breather holes in the base and no attempt to seal up the gap. I remember folk having to switch on the lights to demist the inside of the clocks from the heat  of the bulbs if it got too misted up when temperatures dropped suddenly.

Probably Nippon fixed a problem or later versions were new and improved (found a way to make them cheaper).

Regards
Dave

ozzybud:
Its off a 71,72 or 73 CB/CL 350

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