next motor issue

[bluerunner]

After successful water pump rebuild, I have another engine issue. Boat was traveling significantly slower than it should for given RPM, load, and water conditions. It didnt feel like the engine was working hard or sluggish, but close to a 10 MPH (by GPS) loss at 4000 RPM. Trim adjustment didnt seem to matter. No significant surging, although RPMs did fluctuate a little with a given throttle position. Occassional odd vibration when throttling up. Boat was having a difficult time getting up on plane on occassion. It almost felt like we were dragging something. Nothing in the prop, hull has no water in it. Suggestions have been slipping hub, exhaust gas escaping around the prop instead of through, bad gas, and mis/non firing cylinder. All these seem to hold merit. Plugs are clean, lower unit oil clean, was going to remove the prop tonight and check the hub, but that will have to wait till tommorrow. Wouldnt a slipping hub, get hot in short order and completely fail?

 

[HighTrim]

Re: next motor issue

What was your WOT RPM and at what speed?

Could be all of the above mentioned items. Would start with checking the hub, possibly on the way out.

 

[bluerunner]

Re: next motor issue

What was your WOT RPM and at what speed?

Could be all of the above mentioned items. Would start with checking the hub, possibly on the way out.

Not knowing exactly what was going on, I never pushed wide open, although I feel the motor would have answered without hesitation. I never pushed past 4.5k which was about 27mph by GPS down from 30+ in similar conditions.

 

[HighTrim]

Re: next motor issue

It almost felt like we were dragging something.

You did remember to unstrap the boat from the trailer didnt you?? lol

 

[bluerunner]

Re: next motor issue

You did remember to unstrap the boat from the trailer didnt you?? lol

I wish the answer was that simple. I actually did put my snorkle and inspect the underside of the hull to make sure it was intact

 

[JB]

Re: next motor issue

Do you think you could tell us what make and model engine you are talking about, runner?

 

[bluerunner]

Re: next motor issue

Do you think you could tell us what make and model engine you are talking about, runner?

'99 Johnson Seahorse 90