Motorcycle Repair: yamaya specs...., spark plug gap, spark plug gap specs

Question
I have a 1975 yamaha enduro gt80  I am trying to get the point gap and spark plug gap specs and maybe a few carb tuning tips  the carb has 2 screws..   a big one with a spring and a small brass one ...I cant find any factory settings for this stuff...  Hope you can be of a little help ...Thanks alot...  

Answer
Hi Kirby.
 I don't have the specs for your bike either.  However, the settings should be in the repair manual.  If you have a Haynes or Clymer's manual and the specs are not there, then you need to get the FACTORY manual through the dealership.  Be very specific about needing the factory manual when ordering.  The factory manual will have every single setting and spec on the bike.

The large one should be idle speed and the small one is likely to be mixture.

Good luck.
FALCON