1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

SparkieBoat

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I have a 1994 J150ELERA. I have checked out everything I could think of. compression is 92-95 PSI on 5 cylinders with 99 PSI on cylinder #5 which has been bored .020 and has a new piston/rings. All other cylinders have new rings and bearings, All were honed and are within specs. There is no sign of water intrusion into any of the cylinders. All gaskets and seals are either new or in good shape. New upper and lower crank seals. motor turns over easily by hand with plugs out.

Timing has been checked and rechecked while running down the river. all linkage is properly adjusted and in good shape. All ignition components have been DVA tested and are within spec. All carbs have been cleaned and visually inspected while running down the river, they have a even spray pattern and seem to be working properly. intake manifold/carb/throttle body gaskets and seals all seem to be in good shape with no leaks.

Fuel tank/lines/filters have all been checked/cleaned/replaced. Fuel pump appears to be doing its job.

The engine cranks/idles and runs smoothly, no skipping/miss. It seems to have more power than the 115 I had on the same boat when you first start out, but after you pass 5/8- 3/4 throttle it seems to just not continue to accelerate like it should.

I had a 115 on this same boat (1999 60 degree Evinrude) last month. it ran out great, 40 MPH at 6K RPM with a 17 SS prop. With my new 150 I am now getting 37.5 with a 15 pitch aluminum prop @ 5200 RPM, and 39.5 with a 19 SS prop @ 4600 RPM.

I just do not even know what to check next, I had a 1995 150 GL motor about 2 years ago that did the exact same thing, I never did figure out the problem, sold it. I cannot believe I have another one with the same problem. Now I got to figure this thing out. Please help if you can think of something I have overlooked or missed.

Thanks Sparkie
 

Haffiman

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Have you tried running on a separate canister/tank with 3/8 fuel line and bulb straight into it?
Got a pic of your sparks after 5 min at full throttle?
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Yes I have tried using a test tank. I have not done a high speed shut down plug check. But I can do that, I will not be able to test run until monday. thanks for the help.
 

Haffiman

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Yes I have tried using a test tank. I have not done a high speed shut down plug check. But I can do that, I will not be able to test run until monday. thanks for the help.
Did you use a test tank with connectors, or just the hose down the cap opening?
 

clanton

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

I would check the pack output to coil at the 5200 rpms you posted, all 6 cylinders.
 

j_k_bisson

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Any change you have the wrong lower unit gearing? Meaning you have a higher gear than what was called for this motor? I seam to remember that you bought this from an unsavory character.... By change you have the wrong lower unit that is overloading the powerhead?
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

I stuck the hose down into the gas can. I have a 3/8 fuel line and bulb.

JK, it is possible that the gear case could be a mix match...but the thing I cannot shake is this is exactly the same problem I had with a 1995 150 Evinrude intruder a couple of years ago. I never figured out the problem, sold the motor. but you would think a 15 pitch prop would be a low enough pitch. I thought the V-6 gear case was the higher gear set anyway, the V-4 would be the lower gear. I am not a gear case guru, but I thought there were only 2 gear ratios on the large gear case and the V-6 was the higher gear.

Clanton, I will test the DVA to coils at WOT, I should be doing another test run monday. I will do a high speed shut down and check the output to coils, any other things I should check? but when I went through this with the other motor mentioned above, I replaced every coil, stator, power pack and optical sensor with brand new CDI components and it did not fix the problem, I got about 300 more RPMs and maybe 10 more HP after all the new ignition parts. I sold the new parts to another guy who put them on his motor and they worked great for him.
 

Faztbullet

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Which pack you got ?? You got the grey spark wires??
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

CDI 113-4985 it is brand new, and is within spec on DVA test. new gray wires and new QL78YC plugs at .030, also there is no sign of the coils arcing out on the RF shield.
 

Haffiman

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

This might even be a hull issue. Any hooks etc in the bottom of the boat? Tried to measure out with a 10ft straight 'ruler'. It may be that your boat simply stops at that speed due to some 'deformation'. Got some pics of boat and bottom??
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

I can get some pics tomorrow, but I doubt that is the issue. I thought it was possibly a hull issue 2 years ago, when I put a 1995 60 degree 150 on the back of a 17.5 McKee craft, which also did not out perform the 1989 115 90 degree I had on there before. I put the 115 back on and sold the 150, then sold the whole boat. this 2003 SV1900 Sea Pro is in great shape and I just do not think it is a hull issue, but I am willing to check, I will find something straight and measure it and take some pics. I really do appreciate any suggestions. I believe it may be a crank case issue, but I can not image what it could be.
 

boobie

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Has any dlr in your part of the country got a dyno or OMC test wheels ??
 

hidef

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Photos would be interesting. How high is the engine mounted on the transom?
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

yes..I know there is a guy in jacksonville FL that has offered to help me out, he has a shop and a dyno. it is a 2 hour ride...so we will see. I will check with some local shops and see., most of them are swamped and just do not have time to get to it anytime soon, but maybe someone could put it on a dyno for me.

But I already know it is lacking HP. My uncle has a 1986 150 merc on a 20' bass boat, similar hull design as my Sea Pro, he is running a 23 pitch prop and hitting over 55 MPH. the thing goes so fast it is scary. my dad has a 1999 130 johnson on a deep vee 18' mckee craft, it has way more power than this 150, I know I could put his 130 on my boat and hit at least 45 MPH. I can feel the power of my 150 in the low to mid RPM range, it just seems to stop powering up after about 3/4 throttle.

I have a 25" shaft 1987 150 merc, I have been tempted to put on it just for a test, I could jack the plate all the way up, just to see what a REAL 150 would do on this boat. I should be pushing 50+ MPH easily.
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

Photos would be interesting. How high is the engine mounted on the transom?

I will take some pics tomorrow, It is on a 4" jack plate and I have it jacked up pretty high. the center of the prop is about 4" beneath the bottom of the boat
 

Faztbullet

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

If the dyno he has is a pressure dyno it will do you no good, you need a hp dyno....
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

roger that Faz. thanks to all who have taken time out to help me. I really appreciate it.
 

aerobat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

from my personal experience i can say that when an engine sounds and feels good it most probably is good. i do not think you will learn anything from a dynotest since your engine does not has any issue. since of course a V6 150 should outperform a V4 115 easily look at the boat/engine combination. is the mounting height correct ? did you trimmed it up to the limit on the speed test ? it may also be that at your particular boat the extra mass of the bigger one makes the boat such tailheavy that the extra horses are absorbed for keeping the tail up and not for reaching a higher speed. do you have a better holeshot in comparison with your 115?
 

SparkieBoat

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Re: 1994 60 degree 150 HP, only getting about 100-110 HP. cannot find the problem.

hole shot is slightly better, motor is on a jack plate and is mounted as high as possible without blow out. I had a F115 on the same boat which weights about 50LBS MORE than my 150, and it did the exact same as the 2 stroke 115 at WOT. both motors out performed the 150, so weight and mount height is not the issue. here is a performance bulletin from yamaha, this is the closest boat I could find, it is 1 foot longer than mine, but about the same hull design and only slightly heavier than mine. and hits 49.5 with a 150. And yes I trimmed the motor up fully during the speed test, I tried all different trim levels up to blow out.
http://www.yamahaoutboards.com/sites...ay-v150tlr.pdf
 
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