New to me 25 outlaw won't pull rpms?
 

Just bought a 25 outlaw and took out on the water for the first time today. It is a 1998 with 280hrs on the meter. The boat is very slow to plane And wouldn't pull over 4000rpm at 49mph it has a mirage plus 21p I am very confused as to why I am not seeing better performance. The prop is a little dirty from previous owner leaving in the water last year but I didn't know how much that should affect performance ??? Please help, thanks p.s. that was six people and gear with stock 330hp 7.4

That's too much weight to make a good guess. Take it back out with a light load and see what it'll do.

Did you test out the boat before purchasing it? If so how did it do then? ...

I agree with Crossett, between weight, and not much seat time with it being a new boat to you your probably not going to see the performance It's capable of! Are you using any tab to help it get on plane with the drive all the way down? I would also Use a gps to see where your speed is, I wouldnt trust the gauge as they are never accurate, if your at 40mph at 4000 rpms or so your about right . I'm thinking some seat and throttle time should help, also learning the boats attitude ( likes/dislikes ) is critical !

If after some time it's still having a tuff time planning, and rpms are not where they need to be you might start looking at prop options!

Congrats on the new boat !!

Thanks for the advice I will try to get back out there today and post my results. The 49 mph at 4000rpm was a GPS speed. Love the boat, just want to get the most out of it.

I would make sure to take it easy on the throttle coming out of the hole, don't want to peg it, you will be replacing the drive before you know it! Dump the tabs and drive and you should plane with no problems, then start to adjust tabs and the drive , small adjustments till you feel the boat lighten up ! Also, if your not familiar with tabs, at speed you need to make very small adjustment at a time, if not you could get in a sketchy situation fast! Good luck and be safe!

Pics?

With a stock 7.4L motor and a full load your speed is about right. It could your tach is off. Try it again with no more than one passenger and see what you get for speed. I am guessing the best speed with your motor and prop will be about 55 mph in perfect conditions. Good luck.

Took the boat out again tonight between rain showers with two people and 3/4 tank. 4100rpm and 51mph GPS. Running a 21p mirage plus with a little scum on it. What to do? Is this slow or about right I thought high fifties was within reach on this setup

My 25 is a mag so its hard to compare but a 21p and only 4100 seems low, seems there is a power issue to me.

Your rpms seem way low to me! How does your hull look, any build up or grime? If not you might want to look at prop options! BB blades should be able to help you with your prop! Also, did you take it out with the previous owner, if so how did it do then?

Well unfortunately I never water tested with previous owner. The hull is clean. I am pretty sure I am looking at prop replacement. How much do you think this will cost.

Prop work varies depending on the work done to it...... BB Blades has a prop testing program you might want to look into, or just have them work the prop you have now, either way i would conact them, they are on here and have helped lots of guys out with prop issues! I sure hope its just a prop issue! Did you have it surveyed before you purchased it by any chance?

i would think a new prop would help for sure with more pitch . did the seller tell you the sweet spot for the drive ? that makes a huge difference on my boat . a new prop shouldnt cost you too much it doesnt have to be brand new people sell them all the time on powerboat swap shop for 300 bucks give or take .

Spoke with a guy willing to let me borrow a cleaver 19p 14 1/2 would this be any better do you think?

First thing I would do is check to see if the throttle is moving the lever on the engine full open when it is wot at the helm. If that checks out, do a compression test. I don't think it is the prop. I still think the tach is off, too. Speed is too high for the rpms unless the prop is marked wrong.

It will bring your rpms up for sure, not sure what it will do for speed!

Get a 22 Bravo one 4 blade , test it , and if you care Have BBlades lab it , best your going to see is low to mid 50's. I have tested a few props on that hull and 3 blades suck cause it kills your cruise speed and you might get 1 mph more top end with a 3 blade , hydomotives are ok but there a stern lifting prop , you need a bow lifting prop as the bravo one is...

i have a 99 hammer with a stock 7.4 mpi (non mag) that was doing the exact same thing, i have a 23 pitch prop and it would hardly come out of the hole and the top end seemed low only running 4k at like 56-58 mph gps the problem wound up being a bad injector on hole 3 replaced injector and now jumps out of the hole and runs 64-65 gps the strange thing is that i never heard it missing until the last time out i pulled plugs and found one spark plug that was excessively clean (no fuel marks, only spark marks) pulled all my injectors out and tested them with a 9 volt battery and the solenoid on injectors 3 wasnt opening replaced and back to hauling a$$

never threw a code, revved up fine in the driveway with no load, and would run good in the midrange after planing up until about 3/4 throttle then there was a dead spot from 3/4 throttle to wot

i would pull plugs and check them and do a compression test while you have them out


oh and my tach is off too because it stills reads 4k at wot but will now hit the rev limiter running down river with 2 people pretty easy

+1 on a 4 blade prop. My boat jumps out of the hole like a ski boat with the 24 Bravo 1 compared to a 23 Mirage. Keep looking for minor engine problems before changing props. Pull the plugs and take a look at them. One dead plug or injector will make a huge difference on top end. Good luck.