The sight glass should show oil whenever the bike is stationary and level, either hot or cold. The warm oil concept generally applies for the easy pouring or viscosity of the oil. Warm oil flows better and is easier to drain from sumps, hoses, radiator's etc. Warm oil will drain better from all areas of the engine to give a better indication of the total oil in the system. The sight glass is generally hi-lo levels from top to bottom. Cheers.
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