fz600rider

Hey guys, I just bought an 86 fz600. I only paid 700 bucks for it. It's piped, jetted, and all k & n intakes. It's in decent shape, you know needs basic cleaning and stuff. One problem, after it starts, it takes a little bit to really get to running good, but doesn't quite get there before shooting oil out of the crankcase breather..it will keep running but I could use some help in where I should start fixing it or at least finding out what it may be. The old owner thought it might be gas shooting out...but when I looked, the oil breather was wet with oil and dripping when I shut the bike off. All the carb intakes were dry. It has k & n air intakes thus the reason for a short crankcase breather. I could really use some help!! Thanks guys!!