After ordering micrometer, bucket retaining tool (useless), shims, and dealing with ridiculous work schedule, finally got my bike back together after 12,000 mile valve adjustment. Fired right up, but after about 20 seconds or so, this banging noise gradually starts. I panic, of course, shut it off. Re-checked clearances, rotated wheel in 5th gear, everything looks good. Spun wheel around as fast as I could by hand maybe 10 or 12 revolutions, oil pumping fine, no sticking valves, all shims seated, now oil is all over engine. I know I didn't drop anything down in engine, no missing parts, no cam caps backwards, I did everything with surgical precision. Put it back together and tried it again. Same thing. No noise, then this sickening banging sound gradually starts. Then it just goes away. Just rode about 40 miles all speeds, everything fine. Anyone have any thoughts on this? I had 4 loose valves, now sewing machine noise is much diminished.
