Not sure what Pinlock is?
In my 1st year of riding 2 wheels, 80's, I had a Suzuki TS100. 6v electrics, a 25w bulb? Was heading back home after a 30 mile rideout....last 7 miles was high ground and thick fog. about 20 feet visibility at best. I bumped the high sided verge so many times, because I was so fearful of veering into the middle of the road. Couldn't see tarmac half the time! Was only doing about 12mph max and it took forever. Never seen fog that thick since.
Was another time on my 185, 6v lights again! It was the strangest conditions I'd ever ridden in. Not very thick fog, more a very deep YELLOW/BROWN mist and was soaking everything. Nothing to do with a yellowy headlight, it wasn't really....I had weird concerning thoughts the the nearby Nuclear Power station was leaking badly and colouring the air! Ridng in Sepia!