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Outboard motor My 40hp outboard motor will start but wont run more than half speed

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  • Master
  • 636 Answers

Check that there are no cracks in the fuel lines, check the wiring harnesses under the hood for wear caused from rubbing against the hood or components hope this helps you out.

Posted on May 11, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

mcgyver468
  • 710 Answers

SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60

Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

Posted on Apr 27, 2009

finish line
  • 207 Answers

SOURCE: replace impellor in yamaha 2 cylinder 40hp

take all bolts out on foot were the two mate drop lower unit down pull impellar cover will be plastic some what roun with a short molded inlet on top when u remove impellar be sure not to lose the key way and when u put the cap on the impellar be sure to rotate it so blades will ben\d in place make sure u dont pintch them when u bolt the cover down MAKE SURE WHEN YOU PUT THE FOOT BACK ON TAT YOU LINE UP THE IMPELLAR INLET WITH THE ONE COMMING DOWN FROM THE ENGINE LINE UP YOUR SHIFTER LINKAGE (TOWARD THE TRANSOM IS WERE IT IS LOCATED bolt it up test with a hose should be good

Posted on Jun 27, 2009

  • 53 Answers

SOURCE: I have a 2009 40hp 4 stroke outboard. It sounds

not enough info. what Manufacturers and model? is it out of warranty? here are some troubleshooting tools and procedures since labor rates at your local dealer could be up to $100.00 per hour. before you start I have two Goals for you. (1) If you learn everything you can about your engine you will become more confortable and enjoy it more. (2)confirm that your engine is ok now. is the noise your hearing piston related, or is it ignition missfire. the compression check and the ignition output test will help answer that. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. Troubleshooting (1) check compression. without the Manufacturer I'm giving you a average numbers. Look at your Clymer manual for specifics. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark output. use a spark gap tester. all cylinders should jump a half inch gap. If all these test prove that the basic operation of the engine are within specification, then we can turn to fuel delivery. unfortunately you didn't give the Manufacturer so I can't give you the troubleshoot procedures for the fuel delivery system. you will need to refer to the manuel. please get Clymer manuel you will apreciate it

Posted on Nov 04, 2009

  • 43020 Answers

SOURCE: 1985 40hp evinrude only runs at half speed

it might be as simple as a dirty carb , but also might be in the ignition ,like a bad power supply module . check for spark on but plugs .

Posted on Apr 25, 2010

dcurryn601
  • 60 Answers

SOURCE: I need to see a

Go to Boats.net and you should be able to look up your parts

Posted on Jul 25, 2011

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Evinrude used a shift mechanism located in the lower unit that is actuated by a rod up to the linkage in the motor housing. It could be stuck anywhere along the way or the gear that shifts on the shaft could be immobile due to rust and corrosion.
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1985 40hp evinrude only runs at half speed


it might be as simple as a dirty carb , but also might be in the ignition ,like a bad power supply module . check for spark on but plugs .

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40hp 1987 yamaha outboard motor will run for 30-60


Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

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