I installed 7th gear during the winter and today I finally tried it. One thing keeps coming to mind as I drive " This is the way it shooden been" (made that up myself)... Anyway I notice a very slight decresae in torque down low. Below 2k rpms.
I'm sure a different cam gear will correct that.
Thats about the only con and it really is hardley noticed. The bike is not a low end grunt power to begin with.
Pros: The bike just settles down smoothly on the highway. I even lugged it down to about 2k in 6th. it did fine.
I debated doing the 7th gear because I didn't want to lose any power in the twisties. I didn't lose anything. Power is still there if you use the rpm range where the power is. Shifting is less often and even it seems to shift better...what I mean is transitions between gears has a much less mechanical feel.
I didn't think I needed it, but I had to change out my bevel gear gasket and when I was there, I still debated on the 7th gear. Now, I wouldn't go back to the stock gearing even if I had a chance to get my money back. Its that good!