1979 GS750 points

[tobaccorancher]

I'm getting my bike ready for the season and noticed that it was back-firing on a short ride. I have not ridden it hard since buying it a few years ago, have been slowly working on it, so have not really put it through its paces. I figured that the backfiring was probably because the timing was off. I started by adjusting the points and they seem to have been gapped a bit narrow, but still in spec. I decided to put them as close to 0.35mm as I could get them. Then I started with static timing. When I put the marks in the window I realized that I could not adjust them effectively because the plate was rotated completely forward. I am ordering a new set of both points and condensers, but am wondering if it is possible that the old worn out points required the previous owner to adjust the timing as far as he could to get it running and it still was actually not quite in spec. Also, I am wondering if it is possible that the previous owner put the wrong points on. It has Nippon Denso points, but is it possible that the bike is supposed to have Kokusan points? If I have to I'll take it completely apart to get back to ground zero, but would rather not if it is impossible to swap in the wrong points. Thanks! Andy

[Big T]

The simplist way to determine which ignition you have is to look at how the condenser mount
ND, you're looking at the side
Kokusan, you're looking at the ends