i tried a few oil even the highly recomended rotella diesel oil (synth & regular) looking for something that did not clunk in 1st and shifted well elsewhere.
i once again came back to what i've found to be the best oil in every bike i've ever owned:
Redline 10w-40 ester (type 5) synthetic oil http://www.redlineoil.com/product.aspx?pid=109&pcid=21
for me it was the only 1 not to clunk and worth the $.
bike shifts like butter.