919 Piston Slap?
I've been lurking these forums for a long time trying to search for a definitive answer, haven't had much luck.
My bike is an '06 919. 20.5k miles on it.
Simply stated, I have knocking noise when accelerating on a cold motor. The colder the weather, the louder the noise initially, and the longer it takes to go away. To my ears, when cold, this noise is loud. By cold, I mean it doesn't go away completely until the fans start to engage in traffic, or a long time riding at normal operating temp. If I had to describe it, it sounds LIKE a pinging noise from low octane fuel, but much deeper. I got the bike at around 14k. I hadn't noticed anything until I switched from a cheapo helmet at around 17k or so, and it started getting colder. The weather is starting to get cool again, and the noise is getting more noticeable. I think it might be piston slap, that's the only noise I can really think that would go away after the engine warmed up fully. This is the one and only issue this bike has ever had.
The noise has not gotten any louder since I first noticed it, other than the fact its louder at first during winters.
I know it's not my chain, and I know it's not pinging. I've had both and solved them.
I have not had my valves checked yet.
Has anyone had to deal with this issue before? If absolutely necessary, I can try to get a video recording of the video, but it's highly unlikely the quality will be good enough to hear it. I'm sorry I have to ask you guys, but you're my last resort. This is my baby now and I want to last me forever, as I'm sure you all can relate. Thanks.