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I have 65 hp mercury outboard wetting no 3 spark plug .what could be the problem?

Posted by James Robbins on

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5 Related Answers

Anonymous

  • 187 Answers

SOURCE: 1994 40 hp mercury force outboard with no spark

If the fuel was not treated with a fuel stabilizer than you probably have a varnish build up in the carburetor. This varnish will clog fuel needle valves and jets. You need to disassemble the carb to clean the jets and needle valves. Sometimes cleaner is not enough you need to us compressed air to blow out the jets. Good luck.

Posted on May 13, 2009

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Anonymous

  • 2 Answers

SOURCE: 9.8 hp mercury outboard shutting off in low idle speed.

My problem ended up being the spring on the reed valve being weak.But at the same time and while I had already had my carb broke down I took a can of carb cleaner to it and cleaned it. In order to replace the spring on reed valve you will have to buy a new one, but don't worry I only payed about $6.00 for mine. You may also look into replacing your primer bulb if you haven't already because may allowing air to build up in your gas line while you are basically idiling.Once you get the carb straightened out you may have to reajust it again. If I might be able to help you again you may contact me at [email protected].

Posted on Jun 16, 2009

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Mark Chapman

  • 1 Answer

SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor

I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.

Mark

Posted on Sep 20, 2009

Anonymous

  • 86 Answers

SOURCE: Spark plug gap 150 hp Yamaha outboard

The correct gap is .035

Posted on Oct 16, 2009

Anonymous

  • 1 Answer

SOURCE: I have a 1990 90 HP mercury outboard. It is rough idling and surg

I have a 90 hp force ob. when i run it with the ears she runs fine lets me bring the throttle all the way up. when i but it in the water thru the wake area i can do 4 mph once i'am out of the wake area and give it the gas she dies, any ideas

Posted on May 20, 2010

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