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79 GS 750 only running on two cylinders

  • Thread starter Thread starter Icculus88
  • Start date Start date
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Icculus88

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So i havent ridden the bike much lately. The battery was dead so i tried to jump it with my vehicle and it blew most of the fuses. I replaced them and now only cylinders 2 and 4 are running. I pulled #1 spark plug and it smelled slightly of gas. It was when i felt my exhaust that i knew which pistons were and were not firing. Is this a dirty carb problem or could in be electrical?
 
Check spark by removing the plug caps in question, sticking a spark plug into the cap, and grounding the metal spark plug threads against the engine while cranking it over. If you see spark, the problem is unlikely to be that.
 
Could be a combination of the two. Get 4 new plugs..or clean the ones you have well with a wire brush and regap them. Then see if it fires all 4. Could be bad pljugs in the 2 cylinders or could be the carbs got gummed up a bit while sitting. You can unscrew the caps on the offending wires and cut about 1/4 inch of and put the caps back on with good wire to cap connections. Try all the obvious before you tear down the carbs though. Put a good plug in the wires and hold it against the engine to see if the wires all have spark...that kinda trouble shooting..I dont think its a coil problem. You said 2 and 4 are running . The one coil runs 1 and 4 and the other runs 2 and 3, so that tells you that both coils are firing. Points are good...one runs 1 and 4 and the other runs 2 and 3..if any of the coils or points had failed you would have lost cylinders 1 and 4 in a pair or 2 and 3 in a pair. But since you have 2 and 4 firing this tells me that neither the points or coils had failed.
 
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thats for the help. Didnt know that about the coils. I will test the plugs and be back.
 
go to BIKECLIFFS WEBSITE and get the free service manual download. Yup, the coils and points work in pairs for the cylinders. 1/4 are a pair and 2/3 are a pair.
 
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