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possible ignition problems?

  • Thread starter Thread starter Gsnewb
  • Start date Start date
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Gsnewb

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completely new here and to owning a gs series bike. i've got an 81 gs750l and did run about a month ago. started to spit and sputter and now when trying to start it'll backfire only on the #2 cylinder and not even try on any other cylinders. The plugs aren't too old and don't look too bad "atleast to me" i was wondering what tests i can do to see what might have gone wrong possibly with the ignition system. the timing on the bike is good valves look good. im planning to do a compression test on it as well and checking carbs for debris just to cover all bases. i appreciate any and all help
 
thanks for the reply. when the bike is sitting idle i like to have the fuel valve shut off and run the carbs empty. have done this my entire life. i did happen to find out last night that the coils had somehow shorted out on me. i found an old manual and did some testing with the electrical system and found the coils to not have any resistance vs needing to get 3 ohms.
 
"when the bike is sitting idle i like to have the fuel valve shut off and run the carbs empty. have done this my entire life. "

With the stock suzuki vacuum petcock, there is no "off" , you got on ,res,and pr. If engine is running, fuel flows in first two spots. In "pr" it flows all the time. Left in "pr" spot, carbs can eventually overflow ,dumping fuel in crankcase which is bad news when you next sttempt to run it. ( The spit and sputter stuff)

It would be hard to short out the ignition coils with 12 volt dc - they are robust. Do some reading at this link- it's loaded with info regarding gs suzukis

http://members.dslextreme.com/users/bikecliff/


 
I have an extra shutoff on the fuel line to fully shut off all fuel going to the carbs for when it sits. I did also happen to find that manual and perform the resistance test it says for the coils and how I need 3 ohms resistance and all I got was infinity/open reading
 
Yes my coils look exactly like that with same connectors. My meter is a fluke 115 and use it all the time for work
 
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