Ignition Coil Overheating

[Andrwbunker]

When I ride hard on the highway - high speed, high revs - The bike will shut down on me. It seems like 2 cylinders cut out, and then shortly after the other 2 cut out. Can Ignition Coils Overheat???


I pull to the side wait 15 minutes and once it started back up. The second time I had to get towed home after 2 hours of trying. The battery is not dead - plenty of charge. But the next day - cranked her over and took right off. The gas is fresh and I've been through 3 tanks since putting her up for winter. I can run the bike for 8 hours with no problems putzing around the back roads and going easy on her. What gives?



Thanks for reading everyone. Its a 1982 GS850G with 29k on it. It was sitting for a loooong time until i finally got it running last summer. I put on a Dyna S ignition, hit the usual suspects and it now runs well. The coils are stock and I don't want to dole out the cash for Dyna coils if I don't have to. Any Advise?

[Billy Ricks]

When I ride hard on the highway - high speed, high revs - The bike will shut down on me. It seems like 2 cylinders cut out, and then shortly after the other 2 cut out. Can Ignition Coils Overheat???


I pull to the side wait 15 minutes and once it started back up. The second time I had to get towed home after 2 hours of trying. The battery is not dead - plenty of charge. But the next day - cranked her over and took right off. The gas is fresh and I've been through 3 tanks since putting her up for winter. I can run the bike for 8 hours with no problems putzing around the back roads and going easy on her. What gives?



Thanks for reading everyone. Its a 1982 GS850G with 29k on it. It was sitting for a loooong time until i finally got it running last summer. I put on a Dyna S ignition, hit the usual suspects and it now runs well. The coils are stock and I don't want to dole out the cash for Dyna coils if I don't have to. Any Advise?

If you have a multi-tester you can check resistance of the coils. On the primary side you want to see 3-5 ohms. Then check the secondary side by placing one probe in each plug cap for 1 and 4 then 2 and 3. You want to see 30k-50k ohms on the secondary side.

You can pick up used coils from a gsxr, Katana, or Bandit from Ebay for about $30 any day of the week if you need them. The latest GSXR coils won't work, they use individual coils on each plug. If they look like yours they will work.

[p_s]

This exact thing has happened to me when the spark plug gap was a little too big. (On another bike with a weak ignition system, this also happened and using a narrower than spec gap solved it until I replaced the coil died completely a few months later.)

[Griffin]

I had a gs750 that would do the same thing. It drove me crazy because I went through everything (including testing coil resistance) several times. After it cut out, if it sat for a while, it would start up and run fine again.

I finally figured it out when it cut out on me in my driveway. I quickly grabbed my multimeter and checked the coils while they were hot. One of them read infinite resistance on the primary side. Once it cooled down, it read normally.

I swapped that coil out with one off my GS700 parts bike, and never had a cut out problem with it again.

[Andrwbunker]

You guys rock. Next step - Replace my coils and I am confident its worth spending the money. Thanks again.

[Billy Ricks]

http://cgi.ebay.com/ebaymotors/Suzuki-Bandit-GFS1200-1200-COIL-COILS-PLUG-WIRES_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1116QQhashZitem130297742115QQitemZ130297742115QQptZMotorcyclesQ5fPartsQ5fAccessories

[chef1366]

That's how a bad petcock acts

[GavinJuice]

gas tank not venting??

[Andrwbunker]

Well I have the coils ordered. When I bought the bike it looked to be a new petcock assembly. Once I get them I'll test the coils to make sure they are good, put them on, and once the weather is right I'll max er out and keep everyone posted.