What motorcycle you got
Or is this a blanket coverage question just to have certain tools?
Many manufactures have specific engine and driveline tools though quite often certain ones can be homemade. Years ago the ol' Easyrider magazine had an entire series of tech tips an tricks to work around things
Other things are more generic like chain tools, belt tensioners, spark plug chasers, of course feeler gauges, bore gauges, piston ring expanders, piston pin pullers, spring pullers, wiring pin disconnect tools, carb jet wire tools, and low pressure air pumps for forks. Even basic tools like 12 point sockets, internal hex drivers, torx, retaining ring pliers. Electrical...simple test lights, spark testers, and DMM's.
Should we even talk about the fuel injections systems on new bikes