High RPM's..low speed???

[HutchBucks]

Took daughter out tubing on Monday...after we were done thought I'd open it up across the lake. Ran very high rpm's(up to 7 grand,usually warning beeper goes off at about 6200-6300,never went off) and couldn't seem to get much for speed(only 25-30mph, usually can get 40-45mph).

This is on a 2005 115 Merc OptiMax...What could cause this to happen? Spun hub in prop? Maybe something else? Also, how do you check to see if prop is spun?

[VMS]

sounds like a spun hub...

If you have a spare prop, put it on and see if it happens as well. If it does, it's not a prop issue. If it does not, I think your problem will be found.

Steve

[Northlander]

Im betting spun hub as well. Especially after pulling a tuber or skier.

[shamrock7]

Your motor should have the new plastic hub system so I doubt that it is the hub. If it is an older rubber hub prop, maybe. Maybe weeds or something else wrapped up on the prop?

[Central Bassman]

Also just check to make sure the right prop is on your boat.

[Surface Tension]

I believe theres you have a choice of a solid hub or the conventional pressed rubber.

If your sure the outboard wasn't trimmed to high, or had weeds or grass on the prop of around the cavitation plate, then take the prop off and have it looked at.

[Shack]

I thought of trimmed to high as well!