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I have a 1990 70 HP Johnson Outboard. It is hard to start, but once started, idles and revs smoothly. It ususally stalls when shifting into forward or reverse, even if it is warmed up. After about 4 or 5 restarts, we finally get it running (by advancing the throttle very slowly), it runs rough for about 20 to 30 seconds then smooths out and runs real sweet at any speed up to full throttle. When we stop and fish, the whole process starts again. The plugs are clean and not fouled. I put in fresh gas, that seemed to help. We did find a small amount of oil in the housing under the carburetors. I haven't changed the gas filter yet (need a part #). I have added startron gas treatment to the gas. Any suggestions?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 7 Answers

SOURCE: Hard starting when cold, runs rough at idle and any steady speed.

Your carburetors need to be cleaned. The pilot jets are at least partially plugged.

If you are comfortable doing this yourself, you need to remove the seats, fuel tank, and air induction system before you will be able to get the carbs out. Be carefull when removing the fuel tank, there is a wire harness that will need to be un plugged from it to remove it. The wire harness plug runs under the plastic tray under the seat. There are 3 plastic rivits that will need to be removed to get to the plug. The carbs come out as a pair, and can be tough to get back in the boots.

You need to remove the float bowls, remove the jets, and blow carb cleaner and compressed air through them all. The pilot jets are most likely the only culprit, but you might as well clean everything if your going to all the trouble. You should also blow carb cleaner and compressed air through all of the other passages while your at it. Make sure that you can see through the jets and there is no debris left in them. Make sure to clean the floats, needle valves, and float bowls as well.

Then re-assemble

This happens when the bike sits for long periods. The fuel we get now days has a very short shelf life before it goes bad. Fuel oxydizes over time, and it happens even faster in a small amount that is vented which is exactly as it is when its in the carburetors of a motorcycle. When fuel oxydizes and evaporates, it leaves a gummy mess behind. The pilot jets are the smallest passages that sit in the fuel, so they naturally plug first.

You can prevent this by keeping fuel stabilizer in your fuel when ever the bike will be sitting for long periods of time. Myself personally, when I store one for the winter, I like to leave the carbs empty.

Posted on Nov 26, 2008

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jaballou
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SOURCE: engine not running

Let it dry out a day or so, perhaps in the sun or a warm place. Try again. If it still won't start, try to find a fuel line or fuel jet and inject some compressed air in to blow it out a bit. Good Luck!

Posted on Dec 16, 2008

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

  • 1 Answer

SOURCE: Is there a diagnostic code "reader" on the Mazda MPV 1993?

I am having a similar problem and my mechanic thinks it's a fuel regulator. Part was ordered and it's being replaced this week. We'll see. Unrelated, I'm/we're having a heck of a time finding an oil pan...mine is very blistered....but it is 17 years old.

Posted on May 18, 2009

  • 10865 Answers

SOURCE: 6hp Johnson outboard stalls & quits

go to an auto parts store and get a can of gasoline additive called seafoam. Read the label so you know how much to add to your 6 gallon tank. This stuff works wonders on outboard motors.

Posted on Sep 16, 2009

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