The right side of the tank is part oil tank and part petrol tank.
I've always wondered what happens if the oil gets really hot and heats up the petrol next to it (...!) :right_anger_bubble:

Well I've never noticed the tank get any hotter than from the heat rising off the engine, which I imagine can only slightly warm the petrol and can that hurt? What about riding in the Sahara desert?? It was quite common practice during the 30's and I've actually used a 1938 BSA C10 tank. I made up oil pipes with Imperial fitting for the tank and US fitting for the oil pump. Ron

email (option): ronpier@talk21.com