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

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Outboard 115 yamaha misfiring at low revs

Misfiring at low revs and ok at high revs

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Unscrew the 4 idle mixture screws 1/2 turn 1 at the time till sneezing stops...
Clean your carburettors

Posted on Oct 04, 2017

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SOURCE: 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 r

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

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After running my johnson 4hp 2s for a couple of hours in the bay it starting giving a strange noise and then cut out.i managed to get it started again but coudnt get above half speed.


Hey Pete.. this sounds serious.... will it rev up while in neutral? If it revs freely and high.. the power head should be ok.. if it will NOT rev up freely and high.. STOP - you are causing more damage..
Check the compression with a good gauge..it should be 125psi minimum.. with no more than 10 psi difference between any two cylinders.. DO this WITH the THROTTLE WIDE OPEN...
Can you turn the propeller by hand while it is in neutral?..Of not.. this is the problem.
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Jul 09, 2017 | Cars & Trucks

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Free outboard repair manuals


very basic carbs ! clean all jets and emulsion tube then check the float needle is clean and the tip isnt grooved , blow threw all ports etc and then refit and set the mix screw 1.5 turns out for starters then run up in a tub of water and fine tune till its happy to idle and rev up ! make of engine ??

Apr 16, 2014 | Clymer Marine Maintenance and Repair...

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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...


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,

Nov 09, 2012 | Clymer Marine Maintenance and Repair...

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Outboard 115 yamaha misfiring at low revs


clean carbs and check set up !

Oct 31, 2012 | Clymer Boating

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Yamaha 115 will not shut off with key or kill switch


not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.

Sep 23, 2009 | Light Outboard Motor Boat Bass Fishing...

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