Question about Clymer Marine Maintenance and Repair Manual '99 '02 Yamaha 115 250 HP 2 stroke Outboards

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115hp 1985 yamaha outboard 6e5 AETO running at low revs as if on 3 cylinders,on low revs only when i accelerate it goes well and fast without issues,when i slow to trolling speeds it runs a bit rough and at idle it will misfire or cough.had the carbies done twice.problem still there.mistified,and also noticed greater increase in petrol consumpsion.

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Sounds like a bad coil or trigger. Find the offending cylinder with a timing light and physically move the coil to a good firing cylinder. If the problem follows the coil, you have it, if not you need a trigger,

Posted on Nov 29, 2012

  • mario martins Mar 27, 2013

    i do not have a timing light but i have an oscilloscope can i use it to find the misfiring cylinder

  • Mike Vhx
    Mike Vhx Aug 21, 2014

    better use a stethoscope

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Posted on Jan 02, 2017

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