Weirdest thing I've ever seen...

[Anonymous]

I have been struggling the past couple weeks to get my 79' gs1000 running correctly. I think I am about there. If anyone saw my other thread here, http://www.thegsresources.com/_forum...496&highlight= , then you saw that that cylinder probably wasnt firing...

So that led me to start checking some stuff out, starting with the plug wires, then to the plug. While the bike was running I took the wire off that cylinder inserted a screwdriver into the plug wire and got it close to a ground to check to see if I was getting spark that far. It was. I then decided to pull the plug and hook the wire to it and ground it to the motor, sure enough, it was sparking.

I decided that I would try a new plug anyway. So I put the new plug in and started the bike with that wire off. As I went to hook the wire to the plug, I saw that spark jumping to the plug, and noticed the extra sound now in the exhaust, like it was now running on that cylinder. I even held it there for a while, and checked the header temp, and it had came right up to operating temp from about 150*. I figured this was good, but when I hooked the wire to the plug, the bike bogged back down like before. So I pulled it back off and let it arc over again, and sure enough, it picked back up....

What in the world is going on here?

I am going to try to switch the plug wires around tomorrow and see if its wire related...Anyone have any ideas?

[vstan905]

You might have a break in that wire

[back_online]

sounds really weird putting the plug wire on that cylinder would make it run worse.

hmm.. firing sequence might be off, and that cylinder is firing during intake or exhaust stroke?

[Anonymous]

Sounds like when you are reattaching the wire, it is arcing off the wire to the engine, causing no spark to go to the cylinder... try swapping wires, try covering that no 4 wire with heater hose (electrical tape will not insulate enough). If it runs with plug wire off of 1 on that one, (On cyl. 4), than your wire is bad and you will need new coils.

[Anonymous]

For what it's worth... a spark that has jumped a gap is more intense than one that hasn't. I know that sounds nuts, and I don't remember why, but I am pretty certain it is correct. So you are in effect boosting the spark by making it jump the gap. I had that happen once with a lawnmower. It would only run if I held the wire some distance from the plug.


For what it's worth.