Rem, do you know if they run rich throuout the rpm range?
Well, most of them do, yes. I checked my 2010 C14 when it was completely bone stock, and it was running rich...11.8:1 area +/- a little. I tried it again with flies wide open and Area-P full exhaust, and it was still running rich...at that time I believe between 11.8 and 12.5 or so. However, I only checked it up to about 7500 RPM...I did not check @ WOT.
You have to keep in mind that butterfly valves aren't all that good at controlling air flow once they're past about 30% open. It's just the nature of butterfly valves in general. This is why the big gains in removing the flies is in the 0-3500 RPM range...beyond that, they're open too far to control much flow. My point is, at cruising speed...lets say 3500-4000 RPM (for me at least) there would be little to no difference in air/fuel ratio with flies in or flies out.
If you look through the forums at some of the C14 dyno charts, you'll see before and after air/fuel ratios on the bottom of the graph. Many of the C14 dyno results I've seen indicate a stock A/F ratio between 12-12.5 most of the time, and they're usually leaned out to the 13.3-13.5 range once "tuned". This makes sense to me as I checked my own stock C14, and it was in that range as well...at sea level at least.
I still think flies removed and a PC5 is the best way to "tune" a C14. It's completely DIY, and the bikes just seem to work better that way IMHO. The Fuelmoto maps were very well done and work very well.
Rem
