I'm not sure to be honest... This is the gear that is "connected" to the clutch housingI believe this is the gear you pictured, correct (below)?
I wanted to inspect clutch discs wear and, just out of curiosity, looked inside the engine.** What led you to look into the engine cases, apparently an issue?
I didn't notice any of this, but the clutch was always quite noisy when engaged (the noise is especially noticable when shift lever is on neutral)I wonder if the engine experiences detonation or some other anomaly that causes uneven movement at the crank shaft?
No modifications were done to the engineIs this a modified engine or one where there is an aftermarket engine controller? Are you running a significant amount of spark advance or high compression pistons?
I always use rev matching when shifting, but maybe the previous owner didn't (I have the bike for 2 years)Could that be caused by excessive early down shifting with out rev matching?