So I was just wondering generally what oil level people run in their engines. I have always thought it better to run the engine on the full mark of the dip stick as there just more oil in the engine. However yesterday took the bike for a bit of a quick fast run, wound it out a bit, the higher it revs the smoother it gets, took it up to a bit over 5000rpm a few times. When I got home it had spat out a fair amount of engine oil through the air filter. I run a ventilator air filter and it was dripping off the bottom of it and landing on the heat shield and battery box cover.