750: White smoke from right exhaust.

Hi.
To day, at the end of the trip of 250 km, from the right exhaust came out white smoke but only when you closed the throttle, no smoke while you opened.
I dont know if can be any relationship beteween, but before to start to day i had a mistake, i have filled 1 liter of oil in the tank more than full so that the engine had more pression (oli came out from oil tank vent hose).
The bike, that always runs great, has the Jim Comstock sump breather.
What do you think about?.
Thanks
Piero

Smoking on a closed throttle is normally worn inlet guides or the inlet guide seals are worn or have moved off the guide.

Wouldn't worry about anything until you get back to the proper oil level, and give it time to clear itself out. Then...what Kommando said.

Any, maybe slight, popping sound out of the cylinder that smokes?