No Spark

My '82 750 Maxim will turn over, but I'm not getting a spark at the plug. Is it the plugs? Wires? Coil?

 

How did you determine it has no spark?

 

Yeah first what did you do to check the spark? It could be plugs, plug caps, coils, battery and other things. Easiest to check would be the battery, Then check the coils the connections are under the gas tank make sure they are securely connected. (Mine had that problem.) Check that and then get back to us and we will get more ideas. Good luck!
Joshua

 

First I made sure the battery had a full charge. Then I pulled plug four and turned the engine over. No spark.

 

OK, good start. Have you checked all the fuses to make sure they're good and that you're getting power through them? If so, have you measured voltage at the coil to see if you're getting ~battery voltage on the Red/White wire at the coils? You'll need to pull the tank and have the key and kill switch on for this step.

 

Yes, I checked the fuses. The coil is next. I've been putting off getting a multimeter. Sounds like it's time!

 

Ok once you checked the voltage let us know what it is. What kind of fuse box do you have? The glass fuses? Or did you replace the fuse box. If it is the glass fuses you need to replace with a new fuse box. You can make your own. They have fuse connectors that have 2 wires and a fuse and you can just crimp them in. That is what I did with mine. Anyways, If the coils are fine, the next easy thing to check side stand relay. Keep going well figure it out.
Joshua

 

If you have a bit of wire you can do a quicky test. What you'll want to do is unplug one of the coils--doesn't matter which one--and run two jumper wires to it from the battery. One wire going to the positive terminal, one going to the negative terminal. Hook the positive wire to the Red/White wire, the negative wire you'll hook to the other wire (this wire may be gray or orange... I don't remember). Note: these connections are to the coil's connector, not to the wiring harness on the bike.

You'll then unscrew one of the plugs that this particular coil fires and set it on the head in such a way as to have it grounded and have the gap visible so you can see the spark jump the gap. Have the coil wire connected to it, too.

When everything is situated the way you like it, hook the positive wire to the battery. With the negative wire in hand, momentarily ground it to the negative battery terminal, then pull it away. When you do, you should see a spark jump across the spark plug gap. Repeat this several times to make sure the coil fires every time. The spark should be a bright white/blue color, too. A yellow spark means you've either got a weak coil or a low battery. No spark means a bad coil. Repeat the above instructions on the other coil.

Let us know what happens.

(I'm headed to work now, so I'll be incommunicado until after 7pm Pacific time.)

 

Gamuru, That is an excellent test. I wish I would have done that when I did mine