I will use the ZRX Kawasaki cam explanation but 1st back in the day with the air cooled 900 and 1000 kaws for street use we would stick a bigger intake cam in and it produced better midrange and did not need 7000 up for power.
ZRX1100 with full pipe and jet kit nets 113 to 115 hp. If ZX11 ninja cams are added then it goes wild -- above 7000 and hurtin below BUT with just the ZX11 ninja intake you get 4 more hp and all in the mid. No hurt on the bottom and no waiting for 7000.
ZRX1200 with a ZZR1200 intake does the same.
1 needle clip adjustment is all that needs done (sea level to 500 FT) to do this.
Thought if there was something simular with the 919 it is only time on my side.
lol Bobby, respectfully, even *I* am not foolish enough to compare a carbureted bike to a fuel injected bike. I can play jack-off with washers and such in the 599, but it's carbed - that's how it goes. Nevermind comparing 1100 cc to 919 cc and what the cam profile *might* be like, in stock form, on the 1100 ... it's not the same.
But since you wanna talk stories ... (hope I don't f-up your thread) ...
This past Tuesday I took the 919 out. I turned the key to prime the pump, hit the starter and she woke up after a *brief moment* of cranking, like 3 seconds.
Today I took out the 599. I turned the key to prime the pump, hit the starter and ... hit the starter and, reduced choke and hit the starter, more choke and hit the starter and ... no choke and hit the starter ........ after almost 10 minute she finally, less-than-enthusiastically, woke up, like from a deeeeeeeep hibernation.
C'mon, man, really?
Now, that being said, I would NOT shrug a shoulder to +10 - 15 hp. That's about 10 - 15% gain. It's not like it'll cost $1000 (even in Canadian $!) to get it. If we were talking about a 200 hp engine and a 20 - 30 hp gain then many people would say "that's not bad" and go for it. Question is ... where's Bucky?!?!?!? Pipe up bud!