Oil Foaming - lots of tiny bubbles...
Returned from a ride and noticed the idle hammer (?), clatter (?) was a bit louder than usual. I have near 18,000 mi on the wee now and the idle hammer has never been an issue. I shut the bike down, and in looking the wee over I noticed in the oil inspection window the oil frothing with a slew (meaning many, many, many) tiny bubbles.
I'm not an aggressive rider and the oil light didn't come on. Put it up on the center stand and waited for a while and checked the level. Oil level is right at the full mark.
I've been running Shell Rotella T Syn 5-40 without problems until now.
Possible causes???? Contamination?? Is there an oil check valve that may be sticking (could this be causing the louder clatter - Cam Chain??) Other??
Anyone have any ideas??