Sudden or sustained high RPM operation can cause blowby. Yosh had this problem on their bikes in the 88-91 season. Their solution was to run the bikes oil level a little lower than stock. But of course worn rings another cause. How many mi. on this bike?
Well from what you guys said it sounds like my motor needs an overhaul. The motor has over 60,000 miles on it......but it was rebuilt at 30,000 (so I was told) I wouldn't be suprised at all if she needs new rings ect.
Damn she almost finished the season! Only put 75 miles on it this year......all drag runs! I'll have to tuck her into bed for the winter, my zx9 will have to help me win the street fighter class at New England dragway.