hi all, im going to start doing my own servicing and was wondering if i have to actually remove the derby cover to fill the primary with oil as i dont want to damage the o ring behind? could i just fill the primary with the small chain inspection cover instead any ideas would be very helpfull.  this is my 16000k service and i own a 07 custom sporty thanks guys, im new to the more complex side of all this

Step 1. Buy borrow steal workshop manual.

Step 2. Follow manual.

Step 3. If stuck consult forum.

You jumped straight to step 3.

thanks fellas i will fill it from inspection cover but i might have to take derby cover off anyway to adjust the primary chain or at least check it, but thanks for the input