Well, no point in tryng (CDI - it got electronic ignition advancer controller), and you have no suitable contol opening for that. It's either works or not :)
To check valve timing it is enough to take central bolt-plug from left casing cover and rockers cover (comes out together with rockers BTW) and check marks.
For igintion best is to just follow troubleshooting of all ignition chain as per DR workshop manual. Drop me your email address I'll email it to you. I have sent it to one of DRers in the past and still have it in my mail, so can forward.