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Repair of Stator and Field Coil

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  • #1

    Repair of Stator and Field Coil

    So found out after a 60 mile ride that the charging system just doesnt work.
    Had to push/pop start the bike to get it home (several times)

    Opened manual, checked resistances on both stator and field coil - Values are so far off i cant even believe it, 0.4 is the number to look for and mine is pulling back 25 on the 3 white wires

    3.5 is called for on 2 pin plug, getting 50

    Pulled both items off bike and re-checked, same numbers.

    Anyway to repair these or have the 35 yr old items just junk now?
    80 SG
    Tags: None
  • #2
    I do not think they would be easy to repair. You can probably find a good used set real cheap from a member or off of EBAY. I would also check your connectors to make sure they are clean and making good a connection.

    Here is one for a 1978.

    http://www.ebay.com/itm/1978-Yamaha-...3ccaea&vxp=mtr

    Bill
    1980 XS1100 SG
    Jardine Spaghetti with Harley Mufflers

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    • #3
      Never heard of both going bad at the same time. One or the other but not both.

      They usually short to ground.
      Greg

      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

      ― Albert Einstein

      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

      The list changes.

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      • #4
        I think that each white wire is 25 volts before the regulator-rectifier adjusts it.
        Skids (Sid Hansen)

        Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

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        • #5
          Originally posted by skids View Post
          i think that each white wire is 25 volts before the regulator-rectifier adjusts it.
          ac.............
          Greg

          Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

          ― Albert Einstein

          80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

          The list changes.

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          • #6
            So my multimeter (harbor freight) was doing something weird
            Cleaned all connections then saw a post where somebody put the 2 leads of the MM together and to subtract that reading, so after doing that both the stator and field coil are in spec.
            Following up to reg/rec tried to unplug connections and it was stuck together!
            After some good force to pull it apart found the black wire had melted a bit into the connector, going to test this next but the reg/Rec is probly bad by looks of its connector
            [IMG][/IMG]
            [IMG][/IMG]
            Last edited by justinc1081; 07-26-2015, 01:15 PM. Reason: adding photo
            80 SG

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            • #7
              Did you test both coils for short to ground?
              Greg

              Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

              ― Albert Einstein

              80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

              The list changes.

              Comment

              • #8
                Melted connectors in the charging system is pretty common. That doesn't necessarily mean the regulator is bad either. Replace that connector, then clean all the rest and make sure your grounds are good too. At that point recheck the system, that may be all it needs...
                Fast, Cheap, Reliable... Pick any two

                '78E original owner - resto project
                '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
                '82 XJ rebuild project
                '80SG restified, red SOLD
                '79F parts...
                '81H more parts...

                Other current bikes:
                '93 XL1200 Anniversary Sportster 85RWHP
                '86 XL883/1200 Chopper
                '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
                Cage: '13 Mustang GT/CS with a few 'custom' touches
                Yep, can't leave nuthin' alone...

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                • #9
                  Originally posted by crazy steve View Post
                  Melted connectors in the charging system is pretty common. That doesn't necessarily mean the regulator is bad either. Replace that connector, then clean all the rest and make sure your grounds are good too. At that point recheck the system, that may be all it needs...
                  +1.....the melted connector is usually just a sign of a bad connection there.
                  Greg

                  Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                  ― Albert Einstein

                  80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                  The list changes.

                  Comment

                  • #10
                    Contact Geezer on this site for those plugs, or order directly from his website here

                    http://www.oregonmotorcycleparts.com/connectors.html
                    Try your hardest to be the kind of person your dog thinks you are.

                    You can live to be 100, as long as you give up everything that would make you want to live to be 100!

                    Current bikes:
                    '06 Suzuki DR650
                    *'82 XJ1100 with the 1179 kit. "Mad Maxim"
                    '82 XJ1100 Completely stock fixer-upper
                    '82 XJ1100 Bagger fixer-upper
                    '82 XJ1100 Motor/frame and lots of boxes of parts
                    '82 XJ1100 Parts bike
                    '81 XS1100 Special
                    '81 YZ250
                    '80 XS850 Special
                    '80 XR100
                    *Crashed/Totalled, still own

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