GS850 with M-Unit not starting

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  • caselat
    • Jan 2026
    #1

    GS850 with M-Unit not starting

    Hello all, I just recently redid all my electricals and routed everything through the m-unit. Everything seems fine, starter motor is turning over and plugs have spark.

    When I let the bike sit for a while (a day or so) I'll get a little sputter of a start but never anything more than that. Carbs have just been rebuilt, bowls are full and everything was running well before I did this.

    Could this possibly be a grounding problem? I know I need to run more grounds to the frame since the negative on the battery smokes a bit. Maybe the spark plugs are out of sync or something, not sure if that even makes sense.

    I figure this has to be something electrical but I can't figure out what since there's spark. Anyone have any ideas?

    This is an 80' GS850
    Tags: electric, gs850, m-unit, munit, starter
    • posplayr
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      • Dec 2007
      • 23673
      • Tucson Az
      #2
      Did you follow/recheck the directions?

        Comment

        • tom203
          Forum Guru
          Past Site Supporter
          • Aug 2010
          • 8925
          • Norway,Maine
          #3
          ".... since the negative on the battery smokes a bit. Maybe the spark plugs are out of sync or something, not sure if that even makes sense."

          find out why it smokes a bit real soon. Make sure that you have plug wires on correct spark plugs. Sitting on bike, the left ignition coil fires 1 and 4 spark plugs, etc.
          1981 gs650L

          "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

            Comment

            • 850GT_Rider
              #4
              Originally posted by caselat
              Hello all, I just recently redid all my electricals and routed everything through the m-unit. Everything seems fine, starter motor is turning over and plugs have spark.

              When I let the bike sit for a while (a day or so) I'll get a little sputter of a start but never anything more than that. Carbs have just been rebuilt, bowls are full and everything was running well before I did this.

              Could this possibly be a grounding problem? I know I need to run more grounds to the frame since the negative on the battery smokes a bit. Maybe the spark plugs are out of sync or something, not sure if that even makes sense.

              I figure this has to be something electrical but I can't figure out what since there's spark. Anyone have any ideas?

              This is an 80' GS850
              Smoke on or near a battery is rarely a good thing. There's a really bad connection or cross-connection someplace.

              Start over. Disconnect everything, then hook up one thing at a time. You gotta isolate that issue.

                Comment

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