104 no spark

[kycub]

Started work on my 2nd 104 that I got a few days ago. It needs a new ign switch, but I was able to jump the harness plug to get it to turn over. I found that it doesn't have spark. I verified power to the + side of the coil. I inspected and re-set the points to .20. Tried a known to be good coil, and capacitor. Still no dice. Besides going over the main wiring harness, is there anything I'm overlooking? Meanwhile, here's it brother ready for the mowing season.

[thomas 1863]

try putting some fine sand paper like 400 grit or higher inbetwin the points when they are closed and run the sand paper accost both sides get any rust off them ive also see where theres like wax on them when they are new to protect them thats what id try also might want to try a different condenser

[zippy1]

Did you try a new plug?

[Yosemite Sam]

When I get a new Cub and the wiring is suspect I:

Hook the positive wire from a jumper box to the "A" terminal on the S/G and hook the negative wire to one of the bolts that hold the S/G on.

Run a smaller wire (with alegator clips on each end) from the positive clamp on the jumper box to the positive side of the coil.

Then turn the jumper box on and make the engine crank.

If it doesn't acts like it is "getting any fire", I turn off the boost box, then turn the engine so the points are closed, unhook the cable from the S/G, turn the boost box back on and open and close the points with a screwdriver. If the points are making fire, then you will see it (and sometimes feel it).

On the negative side of the coil, there should only be power there when the points are open. If you have power there all the time, it means that your points aren't making contact.

I also have a cheapie tester that goes between the plug wire and the plug, you can see the fire there too.

That said: Your engine needs to be "timed" so you are getting fire at the right time, if it isn't firing at the right time it will never start. Twenty thousandths does't always do it.

[kycub]

Ok, thanks. I did try a good condenser, but it didn't help. The points looked clean, but I can try the sandpaper. Can't hurt.

[kycub]

It isn't firing period. I also have the in-line tester you mentioned. I haven't checked the timing, but that wouldnt cause it to have no spark, just not at the right "time", correct?? I didn't try a different plug. I figured if the tester wasn't showing anything it wouldn't be the plug?? And I checked it on my other 104, the bulb isn't blown.

[1650noob]

maybe the ignition switch isn't connected properly. I had that happen to me once. I replaced it worked good. A new spark plug I would try too.

[Yosemite Sam]

I'm pretty sure that the plug has to actually spark for it to show up on the tester.

You are correct, it doesn't have to be "timed" to get a spark.

Still have to have a spark at the points before you get a spark at the plug.

We are all rootin for you.

[cubs-n-bxrs]

I would for sure try a new plug and spark plug wire also.

[Grampie]

Did you try running a HOT WIRE to the coil from the battery to bypass everything else that might be an issue?