I believe they ran points right up till mid 90s when deleted (MX80). In fact I never had trouble with them so did not try to change. But can see no reason why earliest YZ80 ignitions could not be adapted, You must be going to do a heap on the top end to make one of those docile little buggers go!!! I have fitted complete YZ80 B/C /D /E five speed internals into MX/GT80 cases ,it is a straight bolt in job! Tim 754