Ignition problem on 9.9 msha

[knot trying]

Took the gheenoe out yesterday and the motor started up ok, but would not get past 1/4 throttle before dying. When I got home I pulled the plugs and one was wet. Hooked up a timing light to both plugs and ran the engine briefly. The dry plug had great spark, but the wet plug had only occational spark.

Now, how to I tell if it is the ignition coil or the CDI?

Thanks.

[Ken]

knot,
Try swapping the ignition coils to see if that makes any difference.
Good luck [img]smile.gif[/img] ,
Ken K

[knot trying]

Don't really understand the suggestion. There is only one coil with 2 leads and I don't think I can swap them as that would really hose the timing, wouldn't it?

Just looking for some diagnostic test on the cdi unit before I drop $190 on it.

[knot trying]

Ok so I got a service manual and started the diagnostics on my F9.9 - no spark on 1 cylinder.

Following a suggestion on the board, I replaced the ignition coil - wrong. Same cylinder - no spark (I have already swapped spark plugs and plug caps to eliminate them as suspects).

So the diags on the I measure the voltage on the CDI output (orange and black) to the ignition coil and it is very low. Should read at 1500rpm about 195 vac, reads around 7vac. So next I check the charge coil output. Should be 205vac, read 40vac.

The pulser coil read from 1-2 vac depending on speed, so it's probably ok.

So if I put this all together, a bad charge coil (didn't know they went out that easy) is not providing enough voltage to the cdi for the capacitor to fully charge and fire for both cylinders, thus only 1 cylinder fires. Very strange scenario, I would have thought that it would be quite random that each cylinder would fire sometimes, but it seems that #1 always fires and #2 never does.

Anyone else had any experience with this kind of failure?

Thanks.