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I bought a boat with a 2003 Yamaha 115 four stroke. It doesn't seem to run very well. I know the gas was pretty old so I sucked that all out and replaced it with added Seafoam. It stills runs kind a bad. I put all the power to it and it doesn't have the power to even get on plane. It seems to rev up good in neutral, but not in gear. Do I need to run it more to get it cleaned out? Also, it has this thing on it. Could this restrict it that much?

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I had the same thing happen with my 50 Yamaha. It seemed like the idle was fine, but wouldn't run well under power. It was a bad spark plug. With the motor running, I pulled the spark plug wire on each and would listen if the idle changed, which was pretty obvious. It did change on three of the cylinders, but not the one. I replaced the one bad spark plug and noticed the idle was a little better. I replaced all the plugs after that. It is surprising how well it will idle with only 3 cylinders firing. When pulling the plug wires be careful to touch only the rubber boot or you will get a pretty nasty shock.

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Well, I sucked out all the gas and replaced it with new gas and some Cheveron injector cleaner and Seafoam. I also replaced the fuel filter and spark plugs. We took it out this morning. The first couple seconds it ran a little rough and then went pretty good, but not great. Got up on plane, or is it plain... anyway, running about 20mph and 3500 rpms. went for about five minutes and then it started to bog down again. by the time we got back to the dock area I was doing about 6.5 mph at 1800 rpms. It is now parked at a shop. mad2cmad

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I had similar problem. It turned out be that my motor was sucking air from a bad gas tank, but I had a external gas tank. I assume yours is a internal tank, could still be the problem.

Also another time when my 4 stroke was acting up it was I think the fuel pump. there is high speed and a low speed fuel pump (I think that is what they were called) and one of them went out.

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  • Your Responses - Share & Have Fun :)

    • CigarGuy
      Quick update: Lucky 7 now has rainbows, fatheads, crappie and light pike in stock. If I remember correctly, scoop of rainbows was $8.99.  Stopped at L&M in Virginia. Rainbows $6.99, fatheads and crappie minnows (scoop) $3.99. I was billed $6.99 dozen for rainbows, but was given a healthy scoop!
    • smurfy
      🤣 you da friggin grammar police!🤔😒🤣
    • leech~~
      I have had the same old Strikemaster augers for years, take care of them and they will last a long time.   I think E-augers are nice for around home lakes or at the cabin. The thing that was a eye opener to me was being in D-Rock in New Brighton getting new blades and there were two guys that just got back from a week in Canada on a big ice fishing trip and both very pissed off at their e-augers dying! They were both buying new gas augers.  
    • LakeofthewoodsMN
      On the south end...   Things are shaping up nicely for the MN Fishing Opener which takes place Saturday, May 11th.  Recent rain has brought up the water levels, which were low.  The walleyes and saugers are in very good shape across the south shore.  Expectations are high. The goto presentation this weekend will be a jig and frozen emerald shiner or other kind of minnow.  Emerald shiners are a staple in LOW and walleyes love them.     Hook the shiner through the mouth and out the gill.  Push the minnow all the way up to the jig head and hook the minnow as far back as possible.  This will give you a better hooking percentage.     Jig sizes and colors?  This is stained water so you can get away with a big heavier jig, which is nice for those who don't fish a lot.  It enables them to have more control and feel the bottom.  A quarter ounce jig is a good size for starters.     In stained water, gold, glow white, glow red, pink, orange and chartreuse, or a combo of those colors, are great places to start.   The limit of walleyes and saugers is a combined limit of six fish, up to four of the six can be walleyes.  All walleyes between 19.5 - 28.0 inches must be released.  One fish over 28.0 inches can be kept.  The possession limit in MN is one daily limit of fish. Whether intentionally or unintentionally, there will be some good pike caught this weekend.  The pike season on LOW is open year round. The limit is 3 pike per day with one fish allowed more than 40 inches. All fish 30 - 40 inches must be released. On the Rainy River...  Sturgeon fishing on the Rainy River has been excellent.  The catch and release season is May 8 - 15.  The keep season starts up again July 1st. FYI, there will be some nice walleyes in the Rainy River for the fishing opener.  Lots of sturgeon anglers are reporting big walleyes being caught on sturgeon rigs! Up at the NW Angle...  Angle resorts are ready to roll for the opener.  As many of you know, this is the area of LOW where the islands begin.  Lots of structure.     Go to spots for walleyes, neck down areas, shoreline breaks, points and bays which will have warmer water.  In true NW Angle form, be ready for a mixed bag of fish.  In addition to walleyes and saugers, pike, jumbo perch, crappies, and even a few smallies and muskies will be caught.   Again, the goto presentation will be a jig and minnow. Slow trolling a crankbait will also produce fish if need be.    
    • Mike89
      Totally disagree Gim. I have a gas Jiffy legend auger. Never issues. Take a little time to care for it before putting it away and good to go. Sincei started using non oxygen gas, startron and seafood in never have issues with my 2 strokes.   seafood???   I'd try seafoam!!!   🤣
    • smurfy
      Totally disagree Gim. I have a gas Jiffy legend auger. Never issues. Take a little time to care for it before putting it away and good to go. Sincei started using non oxygen gas, startron and seafood in never have issues with my 2 strokes.   Guess when them damb helicopters from my maple tree arrive I'll  find out how good she blows,  doubt I'll  get a chance first with Stormy to compare!🤭   Anyone got trumps number?😄
    • gimruis
      Wow, 600 bucks for a battery powered lawn mower?  Guess I didn't realize they costed that much.   I assume most people now are using battery augers in the winter.  I remember when they first came out everyone thought they were a joke.  Things sure have changed on that front.  I hardly see anyone using a gas auger anymore.   The selling point, at least for me, would be to avoid having to do any engine maintenance.  Small 2 stroke motors are a pain in the rear to maintain, and unreliable at best.
    • Mike89
      I'll bet she's better at it!!!!  
    • leech~~
      That thing should blow better then Stormy Daniels!  🤣🤣
    • smurfy
      Well yesterday I gave the green nazi's the middle finger 
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