The joys of an older bike! :lol: I'm just in the middle of splitting cases because my 125 was burning water. A leak down and compression tester for older bikes will be well used tools. Snap on, mac, etc all make nice ones but a nice OTC or the like will work great for as little as you will use it. I can't say for sure but Tool Zone on I25 always has a nice assortment of well priced automotive tools.

Another must for older bikes is a service manual. Haynes and Clymer are nice but a factory one is the jam!