5 HP Nissan No Spark

I usually stick with my old OMCs but... (How many times have you heard that?) Anyway, a friend of a friend asked me to look at this motor for him. It's a Nissan 5 HP NS5B 369-1 305xx. The owner had tinkered a good deal with it before I looked at it. He had replaced the coil with one that had the plug wire facing the front of the motor. I tried his set-up..no spark. I then took that coil off, cleaned all the grounds well, cut off 3/8 of the plug wire then reinserted it, and retested. No spark. I also disconnected the kill switch wire and tested again. No spark.

What should I try next?

What does a DVA say about the input to the coil?

I will check. What should it read?

I checked the lead out of the pack to the coil. I got no reading at all. I reversed the wires and tried again. Still no reading.

I switched to my other meter. I am getting approx 40v from the black/yellow lead going to the coil. I checked the troubleshooting section on CDI and it says 110v minimum. The other leads produced voltage that is in the acceptable range. Is it a safe bet to assume it's the power pack?

What are the pulser and ignitor ohm readings? If you don't charge the CD well, it won't have enough for a spark.

pvanv,
White wire to red/black 114; Red/white to ground 97.

Those numbers are OK. Did you use a DVA to read the output of the CD? It should pulse at 198-220 DVA. The exciter should be 135-150 DVA, and the pulser should be 4.75-5 DVA. If you have good input and poor output, you need a new CD.

Thanks pvanv! All the numbers checked out from the input side so I purchased a new CD. Installed the CD and it is running well now. Thanks!

Glad it worked out. Better to test than guess.

Kinda funny now, but the guy that asked me to take a look at it is a friend of a friend and when I called him to let him know the motor was running he asked me how much I wanted for the work, he also mentioned that he had worked at a local marine dealer for awhile but wasn't great at electronics (me neither). Anyway, when he dropped the motor off he also asked me to install an impeller. did that. I had to remove the carb because it was leaking badly. I think he, or someone else, had not put the bowl gasket on correctly so I fixed that and cleaned the carb while I was in there. So, finding the ignition problem (with your help) and acquiring the parts, installing an impeller, and setting the carb right wasn't worth $100. People!

Thanks again though. You helped me through it and I learned a little bit more.

I understand. Have him price out a new 5 hp motor for comparison. BTW, I always do the complete wp kit, as it lasts longer and pumps better, as the side clearances are always a little loose when doing just the impeller.