I have a 75 XS650b. It ran great (one or two kick starter every time). I had the points dialed in well and had good power through all gears. When kicking it over it would often kick back somewhat which made me think the timing could be off. I reset timing many times slightly advanced and retarded. I got my Pamco kit from mikes this weekend . I installed the lower output coils (cheaper kit) and the unit. This thing was almost too easy to install. From start to finish it was no more than 45 minutes and what a difference. I swear I can kick start the thing with my hand now. I can tell the spark is way better than stock because the bike fires up on a 1/4 kick. I just got back from 5 mile spin around town and I still can't wipe the smile from my face. What a great product. When I get my next XS it is the first thing that I'm doing- As a side note I ordered the kit from Mikes on Tuesday and it was delivered here in CA on Friday. Thanks Pete and the rest of the knowledgeable folks on this site!!!