I have long felt that if Norton had stayed continuously in production, the Commando could have evolved in much the same way the Sportster has, keeping what was good and improving what could be better. Interestingly, the engineers who designed the clutch (and I think gearbox) for the Evolution Sportster came from Norton, and had designed the same components for the Commando when it was launched!
But I digress. On the plus side, doing an oil change on the Commando is bizarrely satisfying...
First of all, you will need several copper and aluminium washers. Some of the copper ones you may be able to anneal and re-use, but be sure to have it all ready before you start:
If you do take the tank filter out to clean it, you must use two new aluminium washers (042065), or that sucker will leak.
The reason my oil tank is empty is that the bike sat unused for many months and the oil gradually fell into the crankcase. Wet-sumping can take as little as a week and is totally normal, not a problem. The single most effective remedy is to ride your motorcycle often and regularly, just the way it was meant to.
We'll take a look at the oil tank drain in the next post.
Drain the crankcase as thoroughly as possible. I have the latest type, with both the large sump plug and the smaller one at the front.
Look, I know it's probably supposed to be a 9/16 AF wrench, but really a 14mm will fit perfectly. Both bolts have a magnet, which you should inspect and clean (motor oil is extremely hazardous stuff that should not come into contact with the skin. Wear gloves and dispose of it responsibly):
Above, from left to right, the cleaned components are shown in the order of assembly.