My 2007 GS with 108,000 miles has this cold start rattle I can't figure out.
When starting after it stayed overnight or many hours (engine temp gauge less than 1 bar) it has an annoying random rattle which transmits to the whole gearbox and makes it worse.
Pulling clutch lever alleviates the noise, but the random rattle and mildly disturbed cold idle seems to remain with the engine.
If I rev the engine it is smooth and without any interruptions. Riding, the engine pulls strong and gearbox shifts easy as ever. Once I ride it and it warms up well, idle becomes smooth and the noise is gone while stationary. I am just trying to determine if it's something I should plan splitting the bike and transmission to inspect (it was never done) and if this may be electrical/fuel related when cold, rather than mechanical. And how to go about it. All usual maintenance is up to date including gearbox and motor oil change, valve adjustment and TB sync. I even replaced left cam chain tensioner in hoping it was worn out, but did not help with this cold idle/rattle issue. I know there are two more tensioners, one on left cylinder and one on the front timing chain, under alternator. The noise seems to come from left side but this maybe influenced by transmission being closer there.. I researched many forums and maybe I just didn't do it right, but could not find any information to help me diagnose this symptom.
I recorded a video, by 1/2 way the rattle and random jumps in idle are more evident.
Thank you for your time and thanks in advance for any input with ideas to fix.