Mr Pike Yammie 115

[Northern Eye]

I just bought a 17' Mr Pike with a F115 (mounted one hole up)with a stock ALum Prop 13 x 19P. I have three batteries and a trolling motor in the boat. With full fuel and two people I only seem to get 35 MPH (GPS). I have tried a variety of trim settings and the engine will rev to 6000 but after 4800 it just makes noise no more speed. Does anyone have any prop suggestions?

[Sorny]

>I just bought a 17' Mr Pike with a F115 (mounted one hole
>up)with a stock ALum Prop 13 x 19P. I have three batteries
>and a trolling motor in the boat. With full fuel and two
>people I only seem to get 35 MPH (GPS). I have tried a
>variety of trim settings and the engine will rev to 6000 but
>after 4800 it just makes noise no more speed. Does anyone have
>any prop suggestions?
>
>

Northern Eye,

I have the same motor and boat set-up and a run a 19 pitch Ballastic stainless. The boat will run between 44-47 mph (GPS) at 5500-5600rpm depending on load and temp. I have tried several props and another prop that worked well was a 19 pitch Yamaha Pro Series prop. Speed and overall performance were almost identical, but the Ballistic is almost $200.00 cheaper. My motor is mounted all the way down on the transom.

[Dodge1]

You might find this to be interesting http://www.yamaha-motor.com/products/otb/perfbull/marinepdfs/lund/bulletin_otb_4StrokePerf_MidThrustJetPort_115hp_01 181-LND-Z.pdf

[rvkraut]

I also have the same setup, 13 x 19 stock aluminum, engine is mounted on top hole and run 43 to 44 gps @5800 rpm. Sounds like your engine is mounted too high and the prop is blowing out.

[Northern Eye]

I tried the motor mounted all the way down and had the same results.. Maybe there is something wrong with the stock prop as I bought the boat used. The prop looks to be in good shape although there is a bit of paint missing (must have been run in the sand). I have another Alum 13 X 19 maybe I should give that one a try before spending the cash on a SS.

Northern Eye

[moreyes]

I would look at your prop, and the accuracy of yor tach,are you using your stock speedo is that accurate?. With a stock 19 you should run 41 to 42mph. A Ballsitic 19 and Pro Series 19 are excellent choice for SS.

moreyes

[Northern Eye]

I have been using My GPS as the stock speedo is not very accurate. The tach seems accurate as at about 4400 I'm getting about 29 - 30 MPH. But as I move to full throttle the engine revs but only gain about 4-5 MPH and I've tried a variety of trim settings. Yesterday was a very calm day and we had a 10 mile run to my fishing spot. I tired to get more than 35 but I had no luck. I think I better try the other prop.

[moreyes]

With the aluminum you should turn 6000 6100 rpm and 41 to 42mph.I would go with another prop.

moreyes

[moreyes]

http://www.rbbi.com/folders/prop/propcalc.htm check this out. Prop slip, I get about 11% with a SS

moreyes

[REW]

I wouldn't be suprised if your prop hub were slipping.
If the hub were slipping the engine would rev as normal, but the boat wouldn't speed up at all.

Try your other prop. If that makes no change, get a new prop on a try before buying basis.
If you can spin a 19 pitch prop at 6000 and if your engine is mounted one hole up, and if you have the engine trimmed out as far as possible without cavitation, you will be running in the low 40's.

You don't mention engine trim in your post.

When you first start going with your boat, you should normally have the motor trimmed all the way down or in. By having the motor trimmed all the way down, it will help you get on plane more quickly.

Now, as you accelerate, and your speed increases, you should gradually trim the motor up or out. Continue to trim the motor up, until either the prop begans to slip or cavitate, or the boat begans to bounce or porpoise. If either of these occur; then bump the motor down just a tad.

Typically the difference in boat speed - for your mr. Pike - with a motor trimmed fully in, as opposed to the motor being trimmed out properly will be the difference between 35 mph compared to 42 mph.

YOur problem, might simply be a matter of improper trim setting on the motor.

Take care
REW

[Northern Eye]

I tried the spare 19P prop yesterday and still had the similiar results but they this prop seemed a bit better, although still not 40 MPH?
4500 RPM 25MPH (All GPS speeds)
4700 RPM 28 MPH
5000 RPM 30 - 31 MPH
6000 RPM 36 MPH

I again tried a variety of Trim settings but still had the same results. The boat gets out of the hole quick and about 1/3 trimmed seems to provide the best motor position for criusing but cannot get the speed I should. I think I'm going to buy a new stainless and hope that it will make the difference.

[KHedquist]

Where are you located? Elevation? A good SS prop to try would be a Ballistic 19', I know Cabelas carries them they have pretty good return policy if it doesnt work. But I would check with them first.

moreyes

[Northern Eye]

I'm located in Thunder Bay Elev less than 1000ft above Sea level. I'm going to get a brand new 13 X 19 alum from the dealer tomorrow and move my motor back down to the lowest setting and try it again this weekend.

Thanks for the help.

[KHedquist]

I ahve mine in the 3rd hole, it came stock in the second mounting hole with a sock 19' aluminum. I would try the prop first then move the motor.

moreyes

[hooky]

I have to agree with REW. I have a 2002 Mr. Pike 17 with a four stroke Yamaha 115 hp and I have the alluminum 13x19 prop.I had to get it cupped because it was cavitating while cornering but otherwise it runs at 5800 rpm's and top end is right around 43=44 mph. Good hole shot. That prop should work on your boat! Keep us posted and good luck.

[hooky]

Forgot to mention that it is mounted in the second hole. I called the factory and that is what they recommended for this motor.

[Northern Eye]

I'll try the new prop and leave the motor on the second hole as suggested. I found a Rapture 13.25 X 19 SS for sale. Any advice on this prop?

[hooky]

If you put a level on the bottom of the boat at the V, the cavitation plate on the motor should be even or slightly above the level. Hope this helps.

[REW]

Actually, most deep v boats run best if the cavitation plate is 2-4 inches above the bottom of the hull.

Having the motor too low, simply give you extra drag.
Raise the motor high enough so that you just start to blow out or ventilate in a hard turn.

Take care
REW

[Northern Eye]

I tried a new 13 X 19 Alum from the dealer this weekend and what a differnce. Ran 39 MPH with a full load of gear/gas for fishing and did not have a good stretch to play with the trim as I was on a new lake. It looks like that has solved my problem. Two bad props that came with the boat, maybe that is why I got such a good deal on it?? The motor it still up one hole and think I will leave it there as raising it any more will make it hard to turn without blowout. I would like to run an aluminum sometimes as I'm always scouting out new lakes. I think I will purchase a SS for running the lakes I'm comfortable on. Thanks for all the help. Who would have thought two props would be bad as they looked fine.

Thanks,
Northern Eye

[EPS]

I have had excellent luck with a 13 X 19 Mich Wheel Ballistic and surprisingly good luck with a Solas Alcup 3 Aluminum Prop in the same size... only a few mph slower, but trims out very well and gets the bow up on my Lund IPS Hull.