on my Jap bikes,I always warm up the engine,a good 3 or 4 minutes,turn her off,wait a minute,the check the oil.This way the oil has worked its way all around the engine.wot you check then is the stuff left in the crankcase.This might be total bollocks bet its worked for me over the years.Also remember motorbike oil for motorbikes.not car oil,our clutchs dont like that stuff.