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No Spark 9.9hp Evinrude

S

scruffy63

Regular Contributor
I have a 9.9hp Evinrude 1974 mod.10425S, I have no spark on ether plug. I replaced the driver coil and both condensers under the flywheel and both coils. When I replaced the coils I cleaned the block where they attach so I know the ground is good. Points are set at .20, I put flywheel on and spun it and had momentary spark but it went away and there is no spark on ether plugs. I am at a stand still, can anyone give me some help.
 
You don't say what spark plug you're using... try the Champion UL81J plug.

Clean the points with either lacquer thinner or acetone, then reset them as follows. Also check and reset the position of the coils if needed.

(Point Setting Of Magneto Models)
(J. Reeves)

Set the points as follows. Have the flywheel key aligned with the fiber rubbing portion of the ignition points. Adjust the gap so that a .020 gauge will pass thru but a .022 will not. Should there be any question of the points being dirty (touching the contact with your finger would cause them to be dirty), clean them with a small brush and acetone or lacquer thinner.

NOTE 1: Should the operating cam have a small portion on it with the word "SET" imprinted, align this portion with the fiber rubbing portion instead of the flywheel key.

NOTE 2: Should the cam have the word TOP embossed on the top of it, that is a cam that could be installed upside down and this is simply telling you which side is up. It is not a position where one would set the points.

--------------------------
(Magneto & Driver Coil Alignment)
(J. Reeves)

To align the coils properly, have the metal vertical portion of the coil yokes aligned with the inside edge of the bevel that exists on the top portion of the aluminum seat upon which the coils sit. This creates the proper distance between the coils and the flywheel magnets. Faulty alignment creates friction and the yokes of the coils heat up, turn blue and expand.
 
Yes. Sounds like the points are dirty. I usually dip a clean white business card in lacquer thinner and pull it through the points and then blow with compressed air. It cleans away oils and dirt and removes any particles that might separate the electrodes.

The other possibility is that the stop switch is shorting out. You could remove the clips for it and try the spark test again.
 
I never thought to check the if the points were dirty they did not look burnt but will clean them and do as you say. Will try that tomorrow. Thanks
 
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