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Is it my stator?

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  • Is it my stator?

    Help!!!!
    Can someone help me? My bike [ Yamaha XJ 750J 1982] won't run! No spark and the lights die when I push the start button. I started losing power slowly before it finally died for Good. Well, I can get the bike to turn over when I hook up a battery directly to the starter siliniod, but not luck other wise.

    My Question: If the resistance in my stator is around 9 ohms (twice the suggested 3.6-4.4 ohms) does that mean I found my problem, or would this resistance just result in a less that optimum spark rather than compleate failure.

    (The starter will turn over if I run current directly to the starter siliniod, but it will not turn over using the start button)

    -Josh

  • #2
    Sounds to me like your battery sh*t the bed.
    I can get the bike to turn over when I hook up a battery directly to the starter siliniod, but not luck other wise.
    why can't your regular battery crank the bike?
    A lot of questions here...
    (The starter will turn over if I run current directly to the starter siliniod, but it will not turn over using the start button)
    Either yor battery's fried, or you have bad connections. And just 'cause the battery on a meter still reads 12 volts, doesn't mean that it will put those out under load, such as starting. How old is it? over three years? Toss it. Does it have water in it if it's not a maintenance free job? Is the old battery bulging at the side? If it's clear plastic, can you see white sulfation built up on the cells inside?
    The stator is part of the charging system, and has nothing to do with running and spark.
    . I started losing power slowly before it finally died for Good
    Sounds like the battery finally giving up the ghost, to me.
    Of course, it could be a bad charging system not recharging the battery.
    Either the battery's weak and not charged (bad charging system), or the battery's dead, and won't take a charge.
    If you say that the bike will turn over if you jump it with another battery... what happens when you charge the original battery and try to start it.
    What.. don't have a battery charger? Many shops will charge them for someone for free, or at most a few bucks. They'll also charge it and test it to see if it'll put out under load.
    Charge, test, or replace the battery and try again. And check all your connections and grounds.

    (The starter will turn over if I run current directly to the starter siliniod, but it will not turn over using the start button)
    Could also be bad connections from the starter button, etc. But nothing can be checked for sure till you've got a good battery in the machine.
    "Damn it Jim, I'm a doctor, not a mechanic!' ('Bones' McCoy)

    Comment


    • #3
      I'd try another meter before I tossed the stator.

      If the bike isn't charging, the battery will drain and the ignition system won't have enough power to fire. Other than that the charging and ignition systems are seperate.

      Also 3.6 ohms seem rather high resistance but if that's what the book says for your bike, go with that. Be sure and check that none of the wires from the stator have continuity to ground.

      Geezer
      Hi my name is Tony and I'm a bikeoholic.

      The old gray biker ain't what he used to be.

      Comment


      • #4
        I have tried a old battery with only 8 volts on it and that mannaged to turn over the starter. Also I hooked up the bikes current battery (around 12 volts) and it turned over the starter fine. My switches seem good, I have tested for continuity already. I was thinking my Stator was shorting the circuit some how. When I disconnected the stator, still no luck, but i was told by a freind that the starter circuit must run through the stator. (I am not really to sure about this my self). He did recomend I check the stator and it does seem suspicious that it is way off of spec. I also took my battery to Wal-Mart and they said it tested fine. (not sure I trust them though) I also tried to jump start the bike with no luck. Also, rember that I have no spark. I tested the rectifier, and looked at the ignitor. My Left blinkers are acting a little funny, sluggish and slow, so maybe it is a bad flasher shorting my circiut? I have already checked all my fuses, removed my headlight and display assembly and cleaned all the connections. Still trying to narrow it down.

        I did notice that my rectifier is drawing a load or like 1.5 amps. Does this sound right?

        Please keep the comments comming, and I'll try and update with any clairification needed. thanks.

        Comment


        • #5
          new battery

          you'll be much happier with a new battery. charged properly. And clean all connections.(batt cable ends and the places they connect to ) Then come back and say thanks for all the help.....
          1982 XJ 1100
          going strong after 60,000 miles

          The new and not yet improved TRIXY
          now in the stable. 1982 xj11, 18,000miles

          Comment


          • #6
            Still not working

            Thanks for the help, but still nothing. I got a new battery and checked my conections. Nothing. I am getting frustrated.

            Comment


            • #7
              Try running the bike with the stator unplugged and check the AC output on the wires from the stator. If it's good, you'll get around 15 volts AC at an idle and around 50~75 volts at RPM.

              As I recall this bike has a permanent magnet alternator and doesn’t require power to make power, only RPM. Anyway if it’s putting out good AC, then the problem is most likely in the reg/reg unit.

              Geezer
              Hi my name is Tony and I'm a bikeoholic.

              The old gray biker ain't what he used to be.

              Comment


              • #8
                My bike will not run. That is the problem. Lights work fine, blinkers, horn. I push the starter button and all the lights dim out compleatly and nothing happens. My sillionoid does not even click. Thanks for the advice though.

                Comment


                • #9
                  I just checked the fiche on Yamaha .com. The field coil should measure 4.0 ohms +/- 10% and the stator .46 ohms +/- 10%.

                  Clean your connections and retest. Clean all of 'em in the ignition circuit, too.

                  Oh, by the way, your model also has brushes in the field coil, a likely suspect too!

                  Comment


                  • #10
                    Disconnect the cable from the starter to the solenoid and try the starter button again. Does the solenoid click now? You could have a locked up / shorted starter, or a locked up engine. Can you put it in gear and turn the engine over by turning the rear wheel?

                    If none of the above, then you have a bad connection beteen the battery and starter, including the grounds.

                    Good Luck
                    Steve
                    80 XS1100G Standard - YammerHammer
                    73 Yamaha DT3 - DirtyHairy
                    62 Norton Atlas - AgileFragile (Dunstalled) waiting reassembly
                    Norton Electra - future restore
                    CZ 400 MX'er
                    68 Ducati Scrambler
                    RC Planes and Helis

                    Comment


                    • #11
                      it sounds like some bad connections to me and maybe a bad switch
                      79 yamaha xs1100f standard
                      best 1/4 mile 13.282@99.40

                      Comment


                      • #12
                        Great advice guys. I'll get on it asap and let you know how it went. Thanks.

                        Comment


                        • #13
                          One more thing, you said you had a new battery, did you charge it? I don't think most cycle batteries come dry charged, and need an overnight charge before use.

                          Also if you remove the cable from the solenoid to the starter, touch the end of the cable to the other big terminal of the solenoid that is connected to the battery, if the starter cranks, you have a bad solenoid.

                          Steve
                          80 XS1100G Standard - YammerHammer
                          73 Yamaha DT3 - DirtyHairy
                          62 Norton Atlas - AgileFragile (Dunstalled) waiting reassembly
                          Norton Electra - future restore
                          CZ 400 MX'er
                          68 Ducati Scrambler
                          RC Planes and Helis

                          Comment


                          • #14
                            Batery is charged. My soliniod tests fine. Engine cranks when i run the batery strait to the soliniod, but no spark. (My guess is beacuse I am bypassing the electromagnet in my altinator so it can not a produce spark) I think It may be a problem with my wiring harness. A short somewhere. I have tested my rectifier, relays, and didode block, but they all seem ok. Swithces have continuity. One thing is my main fuse is really hot. Sounds like a short to me. I'll have some time to mess wioth it this weekend. Thanks for all the help.

                            -Josh

                            Comment


                            • #15
                              I think if you had a short your main fuse would blow. (I hope)

                              The alternator and ignition systems are seperate. An alternator problem shouldn't affect the ignition circuit as long as you've got between 10V - 12V at the ignition box.

                              Dumb question:

                              Engine cranks when i run the batery strait to the soliniod, but no spark.
                              You're trying this with the key in the ON position, right? The key has to be ON to get a spark.

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