Need some help with a boat problem

[fisheater]

I have a similar problem with my 40 hp Merc. it wont rev over 2600 rpm in the water while in forward, but if I rev it in neut or rev it revs to 5200+ rpm. It will rev while in forward when its hooked up the muffs on the hose but not on the water. It ran a little rough one weekend so I ran some seafoam thru it while hooked up to the hose and took it out the next weekend find I had this current problem. Any ideas. The plugs seem fine and the compression seems fine.

Jet clogged on carb.

[fisheater]

sORRY,DOUBLE POST

[F16ENGMGR]

You say the plugs "SEEM" fine. Have you changed them? If so it may be the stator.

[Trophycats]

Final Results..My bro took the boat back to the dealer...seems the linkage was not set right, they were more than helpful, after a quick adjusment they took it on the river and it ran like a champ he said..ran 5400-5600 rpms and came up on a plane, with two people in the boat. He was totally satisfied. Thanks to everyone who replied. Warren

[Tyme2fish]

I love a happy ending!!!

[Jbyrd]

Final Results..My bro took the boat back to the dealer...seems the linkage was not set right, they were more than helpful, after a quick adjusment they took it on the river and it ran like a champ he said..ran 5400-5600 rpms and came up on a plane, with two people in the boat. He was totally satisfied. Thanks to everyone who replied. Warren

That is what I thought it sounded like to me ..... the shifting into reverse was the main clue that something was wrong