I have basic mechanical knowledge and a clymer manual and can usually troubleshoot my way out of a problem, but this one has been bugging me...
Problem: My bike makes a clicking sound (at engine frequency) after a couple minutes of running.
Background: The bike is a used 2003 r6 that I bought a couple months ago after getting it checked out by my mechanic. The only relevant mods are an Akrapovik slip-on and a pcIII. Last owner stored the bike for the winter and so I changed the oil and the filter, made sure it was running the correct map, and it ran just fine. It was only after a week that the clicking kicked in.
Observations: It sounds like a baseball card in bicycle spokes. I suspected it was just light pinging, but the sound was not metallic. Still, I didn't rule it out and tried running the highest octane I could buy. It didn't help, so I tried an octane booster. That didn't help either.
I noticed that the clicking is noticable the most at around 4k rpm although it's still audible at idle. Temperature reading didn't seem to have much of an effect on the volume/frequency of the noise.
I've heard bikes with noisy valves but I'm skeptical that's what this is (and I don't see why it would take a couple minutes of running for the valves to get noisy).
I suspected it was the timing but I'm not sure how to tackle that with newer, electronic-heavy bikes (I played around with the pcIII and it cannot be used to change the timing on my model, even with the upgrades).
Thats the problem, suggestions are more than welcome.