What is WOT for 60horse 4 stroke mercury????

[longshot]

A friend has a 60 horse 4 stroke mercury. It does not want to plane out. With the motor trimmed all the way down the boat's nose is to high to see over. The motor only goes to about 3100-3200 RPM wide open. What are your thoughts and ideas?<br />thanks<br />longshot

 

[Newhook]

Re: What is WOT for 60horse 4 stroke mercury????

WOT is 5500 to 6000. Could it be your friend had a few too many burgers since the last outing?

 

[JB]

Re: What is WOT for 60horse 4 stroke mercury????

Howdy, Longshot.<br /><br />You didn't mention what boat it is on or what pitch prop he has.<br /><br />It could have a dead cylinder, could be severely overpropped or there could be a linkage problem.<br /><br />Good luck.<br /><br />Red sky at night. . .<br />JB

 

[roy w. shakun]

Re: What is WOT for 60horse 4 stroke mercury????

I believe the Merc 60 4 stroke and the Yamaha are very similar, powerheads by Yamaha. I have the Yamaha, and the motor needs to be revved. As a matter of fact, 2 dealers and a local Ymaha rep suggested running in the 5000 rpm area, and be sure to be propped out in the upper range of the 5500 to 6000 max rpm. These motors do not have power to plane in the range of rpms that you have mentioned. I am running a 10" by 11" cupped ss powertech prop, on a 18 foot powercat. @ 5400 rpm, I top out at about 26 mph. A monohull of similar weight, about 1000 pounds, would have less drag, and could likely have a bit more prop and top end.

 

[wayne c.]

Re: What is WOT for 60horse 4 stroke mercury????

Not sure if powerhead on 60 hp is Yamaha, I know that the 75 and 90 hp Mercs have Yamaha powerheads, I just bought an '02 90 hp Merc 4-stroke for that reason. Prvious engine was 80 hp Yamaha 4-stroke. WOT is 6000 rpm with correct prop.

 

[longshot]

Re: What is WOT for 60horse 4 stroke mercury????

The 60 horse is on a Tracker 175. I do not think it is plaining the boat.....with me on the front deck(275lbs) the nose is still to high to see over. I do not know what prop is on the boat now.<br />thanks<br />longshot