[gsxcorey]

Forget the 14.7 completely unless you want to damage your bike as that's way too lean with a load on the engine. Someone needs to remove that from the subtitle of this forum.

12.8 through 13.2 with a load on the engine. As the load decreases you can go leaner.

13.2 in the upper rpm's isn't rich unless and actually you go above that and you're getting too lean. It's actually on the lean side, moreso then the rich. 12.8 and lower and you're too rich, but 13.2 isn't too rich in the upper rpm's by any means.

You can go leaner then 13.2 if you really know what you're doing and have a modified engine, different gas, mess with timing, and many other advanced factors, but if it's a stock engine I wouldn't go any leaner then that in the upper rpms

 

[gsxcorey]

You most likely won't notice a difference. We played around on our bike and you can't tell the difference, but you will when you get into the dangerous lean area. Bike is a monster as it's slowly destroying itself. on many bikes even 12.8 through 13.2 won't be that noticeable unless it's not smooth and that smooths it out, but normally to smooth it out you need to alter the afr in a certain area to help with a dip in the curve or what not (dyno needed for that type of tuning). We do lean our map out though as the rpm's go down.