NSR-LOVER wrote:I agree with the most but why in closed throttle there is no oil?

My opinion is that if the bike works and burns petrol then it burns oil too.

Think about it!!!
If you shut the throttle from wide open the motor is only getting fuel/oil for a 1000rpm idle, not a 3000+rpm over run If you are braking from flat out down hill into a bend that could be a lot of revs the motor has to pull, with very little oil.