1984 honda trx 200 starting issues

I just picked up a 84 200 trx. The guy said it just wasnt getting spark. It has no ignition in it right now, and no battery so im pull starting it. i started looking for parts and lo and behold, 90% are obsolete. Just looking for some help on what may be wrong, how to fix it, and where i can buy parts For a quad this old.