Had the bike out for a little ride just now, nothing over 6000 rpm, and pull up to a stop sign and hear a loud whirring noise with a hint of a rattle over the idle, bike is still running. Ease her back to the house and standing there listening around for a half minute and she cuts off. Motor not stuck. I've had an oil leak from the top of the head but nothing major. Also found just a few flecks of cam chain tensioner black plastic in the oil the first time I changed it. Any ideas? Kinda bummed this would happen right at the start of good riding weather but at least it won't be too cold to work on her.