Just got a 115 hp Yamaha 4-stroke installed on my 18-ft Xpress and took it out this afternoon for some break-in running. Love the extra power, the jury is still out about the 170 lbs of extra weight I gained going from a 60hp 4-stroke to the 115hp. I found out real quick that if I let go of the steering wheel, it'll go hard-over to the right in about a half a second - in other words, the engine pulls to the right when going straight ahead and if you let go of the steering wheel, the engine turns to the steering wheel stop. Suspect there's a problem with the way the anode/trim tab is adjusted on the lower unitbut not sure how to fix it. The trim tab is already adjusted to the right (as you look at the motor from the rear) by about 2 "notches" on the lower side of the cavitation plate. Should it go the other direction? Will probably call the dealer on Monday but wondering what Bob and Bubba have for advice in the meantime? Also running a 19" pitch prop as per the Xpress factory recommendation, but find that the engine only turns about 5000 rpm at WOT. Guess I'll need to think about a 17" prop instead?