So I noticed what appeared to be oil on the fins on the front left of the engine today on my XL883. I rode down to the HD dealer and had the service guy take a look. He told me it's a rocker leak and that it's fine to ride it until my 1,000 mile service next weekend (I'm at 950 now). Just want to verify that it's ok to ride the bike with this rocker leak? P.S. What's a rocker?