2002 kawasaki VN 1500 Vulcan Classic "fluid level sight glass" Questions

...see a small reservior with what looks like a radiator cap on it. There should also be an overflow tank located bottom center of the bike. It should have a sight glass on it to see the fluid

...fluid level of the engine's crankcase oil. Add a little when necessary. It's much easier and cost effective to have an extra quart of oil in the garage and just "top it off" when necessary than to ...

...level i just bought a 2001 rm 125 and i dont know how to check how much oil it has in the transmission. Any help? it doesnt have a sight glass or a dipstick. It does have a small bolt on the clutch ...