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2000 Mercury 40 HP outboard motor will not start, how do I trouble, for electircal and fuel problem, where would I get troubleshooting instructions? Thank you

Where would I find some type of electrical and fuel directions on troubleshooting for fire and fuel problems Thank you, DD

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Right, Fiirst establish what is wrong.
1, is there fuel? check the spark plugs after trying to start, they should be slightly wet and smells of fuel.

2. is there spark? take out a spark plug leaving attached to wire and earth ( use a rubber handled tool or you might get a shock)the plug where it is meant to be screwed into the motor, look for a bright blue spark.

It is from here you will track down your problem.
If no fuel.....check all fuel lines then filter then fuel pump then carby bulb on bottom of carby this is the reservoir that has a float that moves a pin to stop and let in fuel in as it rises and falls. clean everything as you go. take off whole carby and soak overnight in a carby cleaner product. if you locate a prob as you go it might solve your problem but while you are at it you may as well service it at the same time. Get new gaskets or make your own from gasket paper or use gasket glues. put it all back together this should only take 30min to do as long as you have right tools. excluding soaking time.

If no spark, this is harder to diagnose as there are more fiddly parts, volt meter volt meter volt meter.......everything! check wires everywhere for loose connections, electric start? cdi unit small black box? wires coming from flywheel ,these send a charge to battery when motor is going and a charge to spark plugs via coils or cdi.

Posted on Apr 21, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

Fame_Guru
  • 483 Answers

SOURCE: Yamaha outboard motor manual

You got it :

http://www.yamaha-motor.com/outboard/service/viewmanuals/outboard_manuals.aspx

here !

Posted on Mar 20, 2009

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

  • 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

  • 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 j_speaks@yahoo.com.

Posted on Jun 16, 2009

Editor925
  • 285 Answers

SOURCE: Missing operators manual for Evinrude 2 hp outboard motor

Your best bet is ebay for a replacement user manual. Take a look around, you will come across one... For the meantime, gas oil ratio should be 50 parts gas to 1 part oil, i.e. 50:1. General care: Dont go full throttle for any length of time. Cruise of 3/4 throttle... Always flush engine after use in saltwater, including washing down exterior. Keep spark plugs in good order and check prop for fishing line wrapped around in near the prop hub. Otherwise, get a yearly service and have them check the water pump and replace as needed, get it tuned etc and gearbox oil changed.

Posted on Jun 20, 2009

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