What is your RPM wide open? Also how is your holeshot?
Big hub props have been known to limit the exhaust on those motors on light, fast boats, a switch to a small hub prop may help. Also some of these need the throttle position sensor readjusted....http://www.screamandfly.com/showthread.php?139959-1996-Mercury-225-EFI-at-W-O-T
Edited by bronco71 (03/26/16 02:56 PM)