nice how you learn something new everyday.... knew about oil expansion but thought it was negligible, this thread led me to check exactly. I am building a new oil aluminum tank for my racer and turns out that at 150 Celsius you can easily get a 10-15% increase, over 2 litres of oil for instance, that's a good 200- 300 c.c., explains the tank "refilling" after a long ride i guess  wasnt considering that in my calcs.
i see it's mostly young dudes here.... because for those with british bike experience, "wet sumping" as it was called was a common experience: literally ALL the tank going down, though with the very small crankcase for just the flywheel (pre-unit), it meant that it would get full to the brim and spit quite some oil from everywhere possible until it was back to the tank. it was very common to fit manual valves on the supply tube, which of course, sometimes you'd forget to open with disastrous results. later properly working check valves came into the aftermarket.
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