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Honda 8 hp outboard accelerates to full throttle on its own. Has happened three times; otherwise runs great. Why?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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captainjeffq
  • 52 Answers

SOURCE: 1974 60hp johnson outboard won't run on full throttle.

Carbs probably need to be cleaned and re-built. Common problem in outboards that havent been run in a while

Posted on Apr 13, 2009

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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

  • 14 Answers

SOURCE: does my 2000 honda 4 stroke 8 hp outboard have a fuel filter?

Your tech may have missed one or two parts of the idle circuit. There is an idle mixture screw hidden under a brass plug (to prevent tampering on the top of the carburator. This passage needs to be cleaned and idle air mixture screw adjusted properly.
There is also an idle air jet located close to the idle mixture screw. The jet should be removed and cleaned as well as the passage that it came out of. The jet is a small brass piece with a small hole and a standard screwdriver slot. Unscrew this, spray brake cleaner through the little holes and spray brake cleaner (using the little straw that comes with the brake clean) into the hole in the carburator. Take some compressed air ( from a small can of compressed air that you use to clean your computer) and spray into the hole. Reinstall the jet and see what happens. If this does not fully fix it, I would return it to whomever originally cleaned it. If the dealer is worth their salt, they will fix it (if they did not clean in the first place) Everybody makes mistakes.

Also, be sure that your oil level is not too high. It is better to be a little low than too high.

Be sure to be using NKG spark plugs DR5HS I assume that both spark plugs look ok.

The other item that affects this motors idle is the thermostat. Feel the top head of the motor. It should be about 130 degrees. Not hot enough to only just touch, but not cool enough to be able to keep you hand on for 10 seconds or more. A temperature gun would tell you for sure, but most people do not have those is their back pocket.

Timing could be an issue, but normally, it would affect all speeds of operation.

A lot of things for such a little motor.

Posted on Aug 10, 2009

  • 770 Answers

SOURCE: 1974 Johnson 70 hp outboard, quits on acceleration.

It sounds like your motor is starving for fuel. At an idle, you have adequate flow to keep the engine running. When you call for more fuel...you sputter and quit. Could be a clogged filter or trash in the line or in a jet. Yes you will have some air in the bulb, but not a great deal. You could be sucking air at a hose connection (loosing some prime)...try this, start the engine and slowly accererate, have someone pump the bulb as you accelerate, see if the engine works properly while doing this test.

Posted on Sep 20, 2009

  • 53 Answers

SOURCE: Honda outboard engine 50hp nrepair manual

Here is a link to clymer manual. honda won't allow free manuals posted online. you will need to purchase. click here

Posted on Nov 05, 2009

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