Originally Posted by def
No carbs on your boxer...those are fuel injection throttle bodies. Before you tackle any adjustments, read some more about how and why the adjustments are made. Also DO NOT DISTURB THE LITTLE BLACK BOX ON THE LH SIDE THROTTLE BODY. That is the throttle position sensor and is factory set and marked with blue paint. Also, do not adjust the throttle stop screws. Doing so will leave you with a bike that does not run correctly. You need to better understand how the fuel system works on the boxer before you break out the tools. I would recommend your buddy up with someone experienced in your neighborhood who will keep you out of trouble while you learn just how and why adjustments are carried out.
Calm down. He hasn't responded to your first suggestion yet.
I second def's suggestions in his previous post. It may help to use a stethoscope/long screwdriver/woden dowel/piece of hose to try to isolate where the 'knocking' is comming from.