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Outboard 115 yamaha misfiring at low revs

Misfiring at low revs and ok at high revs

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  • Clymer Master
  • 1,190 Answers

Clean carbs and check set up !

Posted on Jun 04, 2014

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Posted on Jan 02, 2017

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alicantecoli
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SOURCE: yamaha outboard saltwater series too much

too much oil in mix---- their is a pump for supplying the oil and something is up with this .now what i have found is their is a brass type jet in the outlet and this is no doubt missing but its not a big problem just mix the oil into the petrol ,easy but the air leak is a another problem as this is a fault with the reed valves which sit in the inlet manifold ,if you remove the manifold you will find a set of metal reed valves and they could just need cleaning ,Its a fairly common fault where their is a ingress of salt water from spray and if they are beyond cleaning then you will just have to renew them easy to do but not cheap .What i used to do with my mercury 2T engine was to put a about half a litre of diesel into a tank of fuel with the oil ,now i know it smells but i found this kept the top crank bearing lubricated ,I now have a 4 stroke engine and its superior in every way and uses less than a third of the fuel for the 2T

Posted on Jan 13, 2011

goldbill
  • 184 Answers

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

1 Answer

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...

1 Answer

Yamaha 250vx cards outboard lost rpm wont go above 4200 rpm


clean and balance carbs , compressions all above 100psi ? sparks on all cyls ?

Sep 29, 2013 | Clymer Marine Maintenance and Repair...

1 Answer

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...

1 Answer

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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