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I've just had a eureka moment !! i have bought in the past a gallon of black Waxoyl, i intended to buy it in clear, used a bit on a car underside but it was to messy, the clear is much better. So to use it up i could thin it down considerably with thinners, the thinners will evaporate leaving a thin film of Waxoyl, what do you think ??
You could place a couple of low wattage garage tube heaters under the exhausts when you leave the bike in the garage, that would evaporate the internal moisture out quickly, but I think the best option is just to forget about it, they’ll probably last 15 years, you’ll be 85 with probably more to worry about than rusty exhausts 🙂
I have 341's on my k1 I don't look after them as well as I should.They have been on there for 5 years and there is no rust on them the bike is used in the rain and always long journeys. 50 miles minimum. In that time I have removed them twice to clean them properly. What I have noticed is the left lower pipe fills with water if the bike is stored over winter on its side stand.