Someone will correct me if I am wrong, simple answer, but back in the day, Kerosene was cheaper than gasoline, however, it was quite a bit harder to start an engine with kersosene,(higher ignition temp) than it was gasoline(lower ignition point). So the small tank was for gasoline, to start and warm up the engine. And the bigger tank was for cheaper kerosine . When the engine reached working temp, you switched from gas to kerosene.
that is exactly what i did on my R2--that was back in the 1960's
The small tank also makes a good backup if you run the big tank dry a mile from your truck. All of my early motor cycles were like that and you ran until it died and then changed the valve and headed for a fuel supply. Just dont let the fuel in the small tank go unused for too long.
"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"
instead of perfection some times we just have to accept practicality
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