- Aug 25, 2009
Interesting that you could hear a gurgle from the separator, but are you sure that was when the oil reached the airbox?To be honest I was looking at a .25 bar cracking inline not a complete tap so to speak. Your post though answers a question that I had pondered, in that where in the scheme of things is the check valve as I had noticed that the "feed" was or seemed to be elsewhere.
Started it today with a clear tube, no oil puked at startup, however, went for a 10 min ride up the road and after stopping I actually heard a gurgle from the R6 plastic separator and hay presto opened my air-box drain tap and filled the bottle.
Soooooo..... maybe its the pump after all, but why after a 10 min ride, couple of 2nd 3rd,4th 6.5/7k rpm blaps does it do this, too much oil in the crank would suggest weak scavenge no ?
I would again suggest that you drain the oil bottle, take the airbox plug out, and just start the bike and run it for 15-30 seconds while keeping an eye on your overflow bottle. See if you're getting out of the airbox at startup. That would suggest one of two issues - oil accumulating in the sump after shutdown, or excessive blowby from the piston rings. Since my problem was accumulation of oil in the sump, I know this can be an issue, it would be my main suspect.
If the oil is only entering the airbox while riding the bike, then I think you may be correct, the scavenge circuit of the pump may not be working properly. The crank is forcing the excessive oil from the sump into the breather and up into the airbox.