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70 HP evinrude 4 stroke outboard (pontoon boat). New spark plugs all connections good. Will only do idle speed put I. Forward or reverse won't gain speed

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  • Boating Master
  • 14,580 Answers

I had the same problem with mine, let me see if I can find the picture I took.

Just above the red arrow on the choke, the linkage has to be firmly clipped in that little black clip. Unless that is in place, you are only throttling one carburetor! Drove me crazy trying to find the answer to that one and it happened after the marina engineers had replaced a leaking fuel hose. Mine was a two stroke, but I bet the linkages are the same to the carbs.



70 HP evinrude 4 stroke outboard (pontoon boat). N - 25677137-pydoskg0kuzfsymgthkoaail-5-0.jpg

Posted on May 02, 2015

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Posted on Jan 02, 2017

  • 86 Answers

SOURCE: 1996 evinrude outboard stalls when put in gear

Start by adjusting your idle mixture screw. Start at 1 1/2 turns out and with the engine in gear at an idle slowly turn the screw clockwise until the engine starts to die, then back off a half turn and that will be your proper setting. If you need to you can bump up your idle stop screw just a touch so it will hold also.

Posted on Aug 10, 2009

  • 6 Answers

SOURCE: 35hp Johnson evinrude outboard not running at full potential

Hi, did you buy your engine used? Sounds like your gonna have to get the carb or carbs cleaned. Its possible you could have a stopped up fuel filter, or not enough spark but i am guessing its gonna be the carbs. They got some gunk in em i bet. Probably old fuel turned to gunk from setting up. I had the same problem on my 40 horse.

Posted on Aug 22, 2009

Testimonial: "Hi, thank you very much for your help, I will strip the carb down and have a look. Once again, many thanks, I am very greatful"

buffalonyman
  • 1865 Answers

SOURCE: oil weight to use for 1989 evinrude 2 stroke 90 hp

The oil is mixed with the gas, just buy 2 cycle engine oil and follow ratio mixture

Posted on Sep 29, 2009

  • 95 Answers

SOURCE: outboard motor won't run under load

I have 1969 5hp Johnson. Starts and runs good, but will only push a 14ft row boat slow at low to medium rpm. When at higher rpm the the motor just revs up and the boat slows down to almost nothing just like it has seaweed around prop.Any help would be great.

Posted on Mar 13, 2010

  • 747 Answers

SOURCE: 1987 90 hp mercury outboard kills when putting it in gear

sound like a fuel issue if the engine set for a long period you may need to clean the carburators sounds like they are clogged

Posted on Jul 07, 2012

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