If you ever have to get into the engine for any reason, an impact driver with quality bits is your best friend. Japanese industrial standard (JIS) crosspoint screwdrivers are
also a very good investment. Basic metric wrenches and sockets (1/4 and 3/8 drive)
from about 6mm up to about 19mm or so, and 12v circuit test light are all useful and necessary. Find the largest bolt(s) head on the bike and make sure you have, or can get access to, a wrench to fit them. An inch pound and foot pound torque wrenches sometimes become necessary during certain operations. Like anything else, you can never have too many tools.

......If the need for a specialty tool arises, there's always ebay, or, you can always take the part to a Honda dealer or machine shop that will perform small jobs. Finding good ones is all part of the fun of owning an old Honda.
edit: A spark plug gauge and feeler blades as well as the correct plug socket for your particular bike. The socket especially.