New Merc 30 hp problems

[captainstevo]

I have a 2003 30 hp mercury 4 stroke EFI and have a couple of questions. It is on a Lund Rebel 1650 and runs great for the most part. The problems that I am having are getting the motor to plane out and getting it to idle lower. I am not able to troll below 2.5 to 3 mph forward and 1.5 to 2 back trolling. It also sounds like the motor is bogging down when I try to run at full throttle. Does anyone know what would be restricting the motor? It idles well and starts and runs great.

Also I have heard the rumors that this can be upgraded to the 40 horse as it has the same block and displacement. Does anyone know if this is true and if so, is it worth the upgrade.

[marine_man]

It sounds to me like you have too high pitch prop on your motor (which is probably what came with the motor when the dealer got it). Take a look at your prop - which might require removal, for a 2-digit number before the P on the prop. It might be in the hub of the prop (on the outside of the prop), on the backside of one of the blades, or stamped on the hub, which will require removing the prop.

With respect to idle, I presume you mean that it moves to fast in idle, not that the motor seems to idle too high, correct?

marine_man