1985 65hp Evinrude Spark Problem

[Alex458]

I picked up a 16.5ft Vanguard boat this summer that has a 65hp Evinrude on it ran good then 10 min into the first sail I lost spark on the lowest cylinder, we trouble shooted on the water by swapping coil packs, spark plugs, and wires but problem didn’t follow still no spark on lowest cyl. Took it home and fixed a bunch of little things thinking it could be the cause but no luck. Narrowing it back to the power pack so I replaced that and the boat worked great for 10 min again and then lost spark on the lowest cylinder again. I’m thinking timer base is bad but don’t wanna throw a bunch of money at it without knowing the actual issue, I had also put a new rectifier on it because the original one did not work when I tested it so If anybody could shed some light that would be greatly appreciated! Thanks.

 

[racerone]

Model # of your motor is ?

 

[Alex458]

Model # E65WMLCO

 

[racerone]

I believe you can test the sensor coils and the charge coils for ignition without removing the flywheel.-----You should inspect the pins / sockets in those plug in connecters.---A poor connection or pins out of place can give you the no spark condition.

 

[Alex458]

I believe you can test the sensor coils and the charge coils for ignition without removing the flywheel.-----You should inspect the pins / sockets in those plug in connecters.---A poor connection or pins out of place can give you the no spark condition.

I have taken apart the plug in from the timer base to the power pack because one wire was broke off inside so I fixed that but made no difference then when my power pack came in it ran on all 3 longer but still dropped that one cyl how would I go about testing the charge/ignition coils

 

[ct1762@gmail.com]

you need the factory service manual, a digital multi-meter, and a dva adapter. all in, you are only looking at $50. sounds like a stator or sensor coil to me. the manual would've saved you the trouble of swapping and guessing at which part is faulty.

 

[Alex458]

you need the factory service manual, a digital multi-meter, and a dva adapter. all in, you are only looking at $50. sounds like a stator or sensor coil to me. the manual would've saved you the trouble of swapping and guessing at which part is faulty.

a “sensor coil” is a timer base if I’m correct right? That’s the 4 pin plug that goes to power pack to tell what cylinder to fire.

 

[Alex458]

And also if I get the DVA adapter I’m assuming the best way to figure out what’s wrong would be to put the boat in the water and run it until it loses spark on that one cylinder and then start getting readings from the stator or timer base to see where my problem is since it runs fine when it’s on muffs in my yard

 

[racerone]

It will run " fine " on muffs in your yard running on 2 of 3 cylinders.----Yes it will.

 

[Alex458]

It will run " fine " on muffs in your yard running on 2 of 3 cylinders.----Yes it will.

Running on muffs in yard if I disconnect a plug wire on each cylinder it changes the idle/sound and will run rough which means all 3 are firing but I don’t run it for extended periods on the muffs where as in the water after about 5-10 minutes it will die off to two cylinder and I can take the plugs out and top two cylinders have strong fire and bottom has absolutely none, and like I mentioned before I have trouble shot plugs, wires, coils and power pack so those are out of the equation

 

[Alex458]

you need the factory service manual, a digital multi-meter, and a dva adapter. all in, you are only looking at $50. sounds like a stator or sensor coil to me. the manual would've saved you the trouble of swapping and guessing at which part is faulty.

I have been picking at the boat slowly since the cooler weather is setting in and have checked my stator and timer base with the DVA adapter. My stator is showing about 560 Volts and every one of my timer base leads is reading in the 23-25 Volts. I have yet to put the boat in the water to warm it up enough to make it lose spark on that one cylinder but is it possible that my stator is overcharging since the manual says 450-550 Volts and I’m seeing 560 Volts I know that’s probably unlikely since that such a tiny amount of voltage over spec.