I subscribed to this thread to find out how often others are adjusting this. I just set my valve clearance, and set my manual cam chain adjuster in the process. Things seem a lot quieter now, and most of that may be due to the cam chain tension adjustment. I had not even touched it before this, and it has been about 5k track miles since I bought this track bike. I probably should have given that some attention before now. I probably went way too long, but I'd be surprised if checking with every oil change is needed. But, I don't mind being surprised. Whatever it needs, it needs.