My thoughts on it are, I 100% agree with fog that the synthetic oil led to the clutch slipping. But once it started slipping damage has occurred to the clutch that makes it prone to more slipping, regardless of the oil. I think the fact that yours is better but still not perfect more or less confirms this.
I don't put too much stock in the possibility that the springs are worn to the point of the issue. But I'm only basing this on the history of mine going tens of thousands of miles with out issue.
2006 Ninja500R Purchased new July 2006; 0 miles. Miles as of January 2019; 102,137. It's a GO bike, not a SHOW bike.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.