Wrenching on a motorcycle is similarly rewarding/zen. A little more complex than a bicycle and sometimes requiring some more specialist tools but otherwise pretty much the same thing.

Especially older, carbureted motorcycles with minimal electronics. You can often work everything out and get them going like new again with just some elbow grease and replacing perishables like fluids, seals, gaskets, etc.

Not to mention it's fun riding a bike that previously didn't even kick over before it came into your hands.