5 Reasons Boats LOSE POWER!!!

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TECHNICIAN'S TUESDAY

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busy Marina in the Florida Keys! There is a new video every Tuesday at 4:45 PM EST!
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[Nonplused]

I once blamed my wife for power loss because she gained too much weight. She hit me. Turned out to be a spark plug wire fell off. Anyway start your analysis with the engine not your wife.

[jeffcarter]

Good stuff! I’ve been 8 miles offshore with one motor heading back and nothing better to do than diagnose the problem at 7 mph. It was a complete loss of power. Trim and everything! 115 Honda. 20 minutes later after going through the biggest fuse to the smallest it was....the smallest fuse that was the problem. 10 amp fuse shut the entire right engine down. I replaced that fuse 16 years ago and never had any problems.

[alfakrab]

I just diagnosed this exact issue! 02 Vmax 150 carbd. I had Stuck poppet valve... removed calcification and greesed, also..5/16" ethanol damaged shredded line from primer bulb to engine was hidden in rigging trunk... upgraded to 3/8" (cut grommet at rigging trunk to make fit). Runs like a top now.

[davidwindhausen]

Just got a marlin with a omc 115 took it out to find that at full speed the boat would fall on it's face . It was a rotten fuel line it was sucking air. CHECK YOUR FUEL LINES!

[HookedOnTuna]

Experienced the trim sender issue twice this week. Once on a verado and once on an evinrude G2. Glad to see you mentioned it. Completely ridiculous that this can put your boat into rpm reduction.

[danielrobert]

I found that a leaking fuel connector allowing air to seep in is also a very likely culprit. Check all connections frrom the tank all the way to the carb ... and be happy !

[mikecurtis]

Was out on the lake the other day, and was running WOT when my motor slowed from about 6200 RPM to 5000 RPM. It would run at the lower RPM for a few seconds, and then speed back up. This happened several different times over the first 15 to 20 min. Then I ran around pulling kids on a kneeboard, so we weren't running that fast. After a couple hours of moderate speed boating, I opened it back up to run back to the dock, and didn't have any more issues with the throttle. I'm guessing maybe I had some water in the gas.

[john]

An issue I ran into with reduced power was my belt going out on my 175 verado. I lost half my RPMs at WOT and didn’t know what caused it. No overheats or change in motor sound, just lost power. Having a broken belt causes the supercharger not to run, just decreasing the RPMs. A new belt and she was all fixed up.

[phillipternullo]

Years ago I replaced a COIL on a inboard engine with another bad COIL . That’s right the NEW COIL was bad . I wasn’t familiar with the boat and thought the boat was just underpowered. Until I saw an arc while I had the engine compartment open . I replaced the coil again and thought I gained at least 100 horse power : ) .

[RichaRat]

Good info. I did not know the trim sensor would cause that. The plastic strap with positioner on the rod that the motor pivots on broke and the trim gauge wasn't working. I replaced it before taking it out. Yamaha 200 HPDI

[floridaoutdooradventures]

I had this problem. Mine happened to me this one time when I was going full throttle and out of a sudden, I started losing power. The boat would not go over 7 miles an hour and whenever I would try to go over 7 miles, the engine would just die on me! Turns out, I had water in the fuel system and I think I know how that happened. I believe after I got some gas at the gas station couple of weeks prior, I forgot to close the gas cap, came home and washed the boat with the fuel cap open. That's what happens when you rush things and have millions things in your mind... -:) Better to take it slow and focus on what you do. After that experience, I check the water fuel separator every so often and also add some fuel stabilizer to the gas tank if I don't use the boat for more than 2 months.

[Fireship]

Was cruising on the river for a few hours heading to open water and all at once my carbureted Yamaha150 just fell on its face. If I tried to go above 2, 000 rpm she’d shut down. Come to find out the fuel line in the rigging tube had turned into bloated jelly. That and the heat from the sun made the line collapse. My engine was trying to drink through a straw that comes with a kids juice box. All new fuel lines and she was back to running like new. The morel of the story is change those fuel lines. If they are a few years old it’s time.

[johnurso]

Good stuff !! Excellent advice for any boater...This is why I do a spring make ready on my boats, first mechanically and then cosmetically. Then I do a late fall post season Mechanical before I put her to bed. You can still have problems, even with all that, but it will definitely reduce the chance of it.

[gabrielhernandez]

This might help someone I had the same issue. I spend over a thousand dollars on parts thinking it was stator- trigger which had nothing I was getting water into the cowling so before buying anything make sure you check if you are getting water inside the cowling

[calespinosa]

My boat bogged down on me yesterday on my way to my fishing spot. The motor only has about 49 hours on it. I've had the boat for about a year already. I hope it's just my primer pump not passing fuel.

[Giovanni]

Don’t forget to check for a loose ground connection, had that happen to me 2 times one with a new engine install

[robertpendzick]

Was out on Lake Michigan, motor ran great, stopped, drifted, and then tried to restart, NOPE would not start, towed back to shore. Out of the water, went through the engine, fuel, plugs, screens, nearly everything, and all checked out, went back in, engine fully functional, never found the cause of problem, and never occurred again.

[bottomknockinbaja]

OMG!! THAT BOAT BOTTOM AT 1:03!! I thought I was at the Aquarium! Lol

[GameFishermen]

Optis and verados, thermostats. Being able to read temps and water pressure is a big thing. My verado wouldn’t get up to temp and had low water pressure. Pulled the thermostat and sure enough had issues with rocks in it

[ericdavi]

Diesels love their oil like a sailor loves his rum! Gotta love captain Ron!!!