https://www.vincentownersclub.co.uk...n-of-a-different-way-part-1.10925/post-106024. Here is the bit I wrote about breather timing. I have used this timing for about 12,000 miles now. My bike hardly leaks and uses almost no oil. I think Vincent Speet tried this out as well. The only leak my bike seems to have right now is coming from the UFM. I am hoping there is not a small crack but I will wait till the winter to find out.