I’m at a loss - Evinrude 40

[tphoyt]

Do you have any room to drop your tilt pin a notch? Weight distribution could be a problem with everything so far back.
Just my thought

 

[Keegan7]

Do you have any room to drop your tilt pin a notch? Weight distribution could be a problem with everything so far back.
Just my thought

Tilt is all the way down to ideally keep the nose down. Doesn’t change anything.

 

[F_R]

You’ve got it backwards, it doesn’t start porpoising and bouncing out of the water until the motor picks up and takes off. In this video, it actually had a whale tail on the motor. I’ve since taken it off because it was deteriorating.

Somehow, I just knew it had a whale tail on it. Previous owner put it on there for just this reason--to get the stern end up out of the water.

I watched your video a couple dozen times. That boat is porpoising and throwing water all over the place. Motor finally picks up speed when the prop starts ventilating a bit.

There is nothing wrong with that motor. It is a boat balance/trim/weight distribution problem.

With that, I'll sign out.

 

[Keegan7]

Somehow, I just knew it had a whale tail on it. Previous owner put it on there for just this reason--to get the stern end up out of the water.

I watched your video a couple dozen times. That boat is porpoising and throwing water all over the place. Motor finally picks up speed when the prop starts ventilating a bit.

There is nothing wrong with that motor. It is a boat balance/trim/weight distribution problem.

With that, I'll sign out.

Thanks for the advice, but just to note, I bought the boat and motor separately, so the previous owner didn’t have it on this vessel. I will try putting my battery in the front and raising the motor height. We will see if that actually helps.

 

[Keegan7]

Somehow, I just knew it had a whale tail on it. Previous owner put it on there for just this reason--to get the stern end up out of the water.

I watched your video a couple dozen times. That boat is porpoising and throwing water all over the place. Motor finally picks up speed when the prop starts ventilating a bit.

There is nothing wrong with that motor. It is a boat balance/trim/weight distribution problem.

With that, I'll sign out.

I just raised the motor as far as the top holes would let me. I will test it out tomorrow and see what happens.

 

[tphoyt]

Prop doesn’t look great either. At least file the edges smooth. Those dings can cause problems with cavitation.

 

[Willyclay]

When F_R posts in a thread, I pay attention!

 

[Keegan7]

Somehow, I just knew it had a whale tail on it. Previous owner put it on there for just this reason--to get the stern end up out of the water.

I watched your video a couple dozen times. That boat is porpoising and throwing water all over the place. Motor finally picks up speed when the prop starts ventilating a bit.

There is nothing wrong with that motor. It is a boat balance/trim/weight distribution problem.

With that, I'll sign out.

Hello again F_R,

I took the boat out today with the following changes. I moved the gas tank and battery forward about 4 feet, raised the motor 2 1/2 inches, replaced gray fuel line with rubber fuel hose, and put my 160lb friend at the front of the boat.

The only improvement came from lifting the motor and all it did was stop the water spraying everywhere.

Although, I did notice a strong puff of air coming out of these holes in my air box. This leads me to believe I have bad reeds, would I be correct in this assumption? See attached video.

If it is the reed valves, where would I buy some? It seems the oem ones are unavailable.

 

[jimmbo]

Your initial complaint was poor Holeshot, I believe. What prop are you running? I assume it was on the engine when you acquired it. What is the top Rpm you are getting at WOT?

 

[jimmbo]

it actually had a whale tail on the motor. I’ve since taken it off because it was deteriorating.

Best thing I have heard in a long time

Is this the Location you are using for the Lower Bolts for the Engine?

 

[Keegan7]

Aw eetc he C AM

Best thing I have heard in a long time

Is this the Location you are using for the Lower Bolts for the Engine?
View attachment 383604

Yeah, that’s correct. Before I raised the motor, wood reinforced part of my transom didn’t go down that low, now I just need more bolts, but what’s your opinion on my air box blowing out air?

 

[jimmbo]

Aw eetc he C AM

Yeah, that’s correct. Before I raised the motor, wood reinforced part of my transom didn’t go down that low, now I just need more bolts, but what’s your opinion on my air box blowing out air?

Takethe Air Box off and you will get a better Idea if the Carbs are actually spitting back. I will assume that the Holes you are placing your Fingers over are for access to the Idle Mixture Screws. There is a lot of Air Movement inside a Silencer, and what you are feeling is likely just Resonances. Reeds rarely fail, unless they are aftermarket Fiberglass ones. The pics you posted of them, they don't look too bad. I've seen worse, and they worked fine.
If the Reeds were bad, I doubt you would have gotten on plane as your engine is a Twin and the loss of one Cylinder would certainly kill any power.
On the Videos, I hear a bunch of sounds, but it might just be from the Boat acting as an Amplifier.


Here is something that caught my eye

" took flywheel off, and cleaned residue coming from charge coil"

If there is any Leakage from a Coil, replace it.

 

[tphoyt]

Have you run with the trimming light yet?

 

[Keegan7]

Have you run with the trimming light yet?

Yes it is perfectly in time as I stated in my original post.

 

[Keegan7]

Takethe Air Box off and you will get a better Idea if the Carbs are actually spitting back. I will assume that the Holes you are placing your Fingers over are for access to the Idle Mixture Screws. There is a lot of Air Movement inside a Silencer, and what you are feeling is likely just Resonances. Reeds rarely fail, unless they are aftermarket Fiberglass ones. The pics you posted of them, they don't look too bad. I've seen worse, and they worked fine.
If the Reeds were bad, I doubt you would have gotten on plane as your engine is a Twin and the loss of one Cylinder would certainly kill any power.
On the Videos, I hear a bunch of sounds, but it might just be from the Boat acting as an Amplifier.


Here is something that caught my eye

" took flywheel off, and cleaned residue coming from charge coil"

If there is any Leakage from a Coil, replace it.

I don’t think it should be puffing as much air out as it does, but I’ll look into it more. I was going to replace the charge oil, but had more than one person say they’ve had leaking insulation and the part works just fine. It was also within specs on the resistance test. I also disconnected the plug wires while running under load and it’s definitely not misfiring. Another thing someone suggested was priming it while running to see if it bogs or picks up. It bogged down, so I know it’s not starving for fuel.

 

[jimmbo]

had more than one person say they’ve had leaking insulation and the part works just fine. It was also within specs on the resistance test.

Parts that are Borderline almost always work fine, until they fail...

Hold a card close to front of the carb, and observe it, if it flips away from the carb with some force, and gets coated with Fuel, then suspect the Reeds. If it is only a drop or two, the reeds are likely not too bad.

 

[jimmbo]

Yes it is perfectly in time as I stated in my original post.

It is not to check the Timing, but to watch for Misses, our eyes are very good at seeing even the Slightest Flicker in our Peripheral Vision

 

[Keegan7]

Parts that are Borderline almost always work fine, until they fail...

Hold a card close to front of the carb, and observe it, if it flips away from the carb with some force, and gets coated with Fuel, then suspect the Reeds. If it is only a drop or two, the reeds are likely not too bad.

Am I to do this test at WOT or idle? I ask because I know for a fact at WOT fuel comes out of the carbs.

 

[jimmbo]

I would have said to do that test at Idle and fast Idle, but...

Am I to do this test at WOT or idle? I ask because I know for a fact at WOT fuel comes out of the carbs.

That is Important, and I didn't see it earlier. Now is it coming out in a Spray, or is it just running out? If it being sprayed out, yes the reeds could be an issue, but if it just spilling out, it sounds more like a High Fuel Level

 

[Keegan7]

That is Important, and I didn't see it earlier. Now is it coming out in a Pray, or is it just running out? If it being sprayed out, yes the reeds could be an issue, but if it just spilling out, it sounds more like a High Fuel Level

Spraying lol, definitely not pouring out. It looks like it is vaping/misting out of the carbs about 2 inches while running wot when I had the air box off. That along with the pulsing out of the air box made me think it was reeds