Engine stalls on throttle up

[Steve Moyer]

I took the bilge pump out and there was a little debris in there but not enough to completely clog it. I did find two very small medal shavings though. I reinstalled and it still doesn't work. I tried to find the fuse but have no clue. If anyone knows, please let me know. So I moved on to the exhaust problem, and, Well, unfortunately the two exhaust areas I didn't check before, appear to be tight. Tomorrow a friend is going to come over and run the engines while I hold the safety switches down and inspect through the blowout hatch. I figure if I partially gaffe tape the exhaust ports it should help simulate being under water and force the exhaust out of where ever its leaking from. What do you guys think? I want to be careful it doesn't back the water into the motors.

 

[Julian]

Be very careful with those fumes! I might try getting some really soapy water (more soap than water) and see if you can find the leak the same way you would with an inner tube. Obviously doing this in the water would give your more consistent backpressure and less concern about water intrusion.

 

[Steve Moyer]

Be very careful with those fumes! I might try getting some really soapy water (more soap than water) and see if you can find the leak the same way you would with an inner tube. Obviously doing this in the water would give your more consistent backpressure and less concern about water intrusion.

Wow, excellent thought. Like checking for a propane leak.
You folks are a vast pool of knowledge. Thanks Julian. On my way to west marine to see if they have that pump in stock.

 

[Murf'n'surf]

I'm sure you'll see the fumes/steam with a flashlight.

Good luck!

 

[Julian]

Another tip is use cigarette smoke to find the air flow.....

 

[Steve Moyer]

Exactly what I needed to do. As soon as we started the port side engine I could see water leaking down the side wall. After bringing up the RPMs i could see the water was just pouring out the front hose of the resonator. Of course its the most difficult to reach and it has started raining so, time out. I'll have a go at it tomorrow. Hopefully the resonator isn't cracked or the very expensive hose for that matter. But' it appears to be leaking right at the fitting. Fired up the star side and checked that as well. No problem there.

 

[Murf'n'surf]

Glad you found it. Now go find a skinny teenage boy who wants to earn a quick $20!

 

[itsdgm]

I know I'm late to the party here but it sounds like you've found your issue. That's great.

A couple of things that come to mind are:

1. There should be a breaker switch probably right below the bilge pump switch. Have you tried to reset that?
2. Check the inside of the exhaust hose. If it's damaged/melted it could mean that you have a cooling issue causing that. You'll want to resolve the cooling issue before replacing the hose because the new hose will suffer a similar fate.

Good luck, sounds like you're almost all fixed up.

 

[Steve Moyer]

Glad you found it. Now go find a skinny teenage boy who wants to earn a quick $20!

Right??!!! LMAO. Skinny kid with long, strong, arms that doesn't whine. These days I might as well search for a yeti.
Its tight in there. I think I'll have to take a couple of things apart to even get to it.

Itsdgm, I did check the breaker and it doesn't appear to be tripped.
When I was tighting the hose clamps the first time, these were the more loose than any of the others. Hopefully, I was as lame as the yamaha preppers but I'll be sure to completely remove it for proper inspection. I have to take the other side off to even be able to reach it anyway.

 

[Murf'n'surf]

Unclip the pump and spin the impeller with a screwdriver. It might be seized up.

 

[Steve Moyer]

Unclip the pump and spin the impeller with a screwdriver. It might be seized up.

I did, it moves freely. Wish I had a meter to see if power is getting past the breaker. Maybe I'll pick one up when I get a few more new clamps. If I'm going to take it apart I might as well put new ones in. A few have light rust on them.

 

[Cobra Jet Steering LLC]

From my experience with exhaust leaks , if the exhaust leak is sufficient to kill your engine at speed it is definitely a big leak. I had a sea doo with a leak in the exhaust that held the top end back to 40 mph rather than 55 it also had exhaust water leaking in the hull. You probably have a big exhaust hose either split open on the bottom or completely disconnected. It should be pretty obvious once you get in the back and look closely.

 

[Steve Moyer]

So, hidden behind the seemingly poperly fitted hose was this. (See Pic). What kind of shoe-makers they got working over there at yamaha? I think I found the problem LOL. I'm going to try to reinstall. Any objections from the gallery?

 

[Steve Moyer]

Unclip the pump and spin the impeller with a screwdriver. It might be seized up.

What do you think murf?
Well upon further inspection I found this. It would appear I have a bigger problem.

 

[Bruce]

What do you think murf?

I believe he was replying to another members post about locked up engines that we split into a new thread.

 

[Murf'n'surf]

What do you think murf?
Well upon further inspection I found this. It would appear I have a bigger problem.

If you are asking about the exhaust hose...... Yeah man, you found it and it should be ok to install it properly. Use some dish some for lube if you need it.

As for your bilge pump, get the test meter or cut the wires and tap direct to the battery to test.

 

[Steve Moyer]

Well upon further inspection I found this. It would appear I have a bigger problem. Resonator is toast.

 

[Addicted]

Glad to hear you found it!!

After you diagnose and fix your factory pump, you may want to consider installing a second bilge pump on a float switch. Huge piece of mind, and it has saved my but on 2 occasions.

 

[Addicted]

Well upon further inspection I found this. It would appear I have a bigger problem. Resonator is toast.

Wow! Time to search for a cause. Looks like it is melted?

 

[Murf'n'surf]

Do you have a warranty on this boat? Sorry if that was stated already....