14.6:1 is the ideal air to fuel ratio that an oxygen sensor equipped engine is going to try to maintain. IMO your A/F # are certainly within an acceptable operating range.
A/F RATIO COMMENT 9.0:1 BLACK SMOKE (NO POWER)
11.5:1 RICH BEST TORQUE @ WOT
12.2:1 SAFE BEST POWER @ WOT
13.3:1 LEAN BEST TORQUE @ WOT
14.6:1 STOCHIMETRIC AFR ( CHEMICALLY CORRECT )
15.5:1 LEAN CRUISE
16.5:1 BEST FUEL ECONOMY (EXCEPT FOR HONDA MOTOR COMPANY)
18.0:1 CARBURETED LEAN LIMIT (EXCEPT FOR HONDA MOTOR COMPANY)
22.0:1 EFI LEAN LIMIT
WOT= Wide Open Throttle ...instead of Waist of Time in chat rooms.