Crankcase ventilization jd 14sb

I have a jd 14sb I moth balled for ten years. I got it running after fiddling with carb. The reason I put it away is it burned oil only after two years of use. I figured the rings were bad or the cylinder scored I pulled the head last week to find the cylinder in beautiful shape with crosshatching still evident and everything smooth and in perfect looking condition except for the evidence of burnt oil with carbon buildup Has anyone ever seen the crankcase vent cause an engine to burn oil? This is the silver john Deere mower with the Kawasaki 150v engine