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  • Starter spin

    What is starter spin I see mentioned and what is the "test" for it?
    With enough beer you can do anything...D.Pate

  • #2
    The starter’s drive gears passes through a one way sprag clutch behind the stator’s rotor mounted on a tapered shaft. The 1600s had no key way on that tapered shaft and depended on a snug fit to keep it tight. Ever hear your starter give out a ‘zing’ when you shut the engine off? That’s the engine kicking back on a compression stroke which engages that one way clutch and temporarily spinning the starter backwards for a brief moment. Doesn’t hurt the starter, but over time the bolt that holds the sprag clutch to that tapered shaft loosens up and looses its grip. You hit the starter button and that’s all you hear. The starter spinning, but no chuffing of pistons pumping air through the engine. The 1700 models fixed that with a key way on the tapered shaft.

    https://web.archive.org/web/20180223.../view/187/103/

    #7 key was the factory upgrade for the 1700s. 1600s needs the rotor removed and Red loctite slathered on the taper and bolt re-torqued.

    Comment


    • DEEPHATE
      DEEPHATE commented
      Editing a comment
      I thought as much but I couldn't search it down. I thought I read about a starter spin test but I couldn't imagine what that would entail. I can never find the link to the old site but I bookmarked it this time.

  • #3
    On my 1700 I get a spin upon shutdown periodically. I will be changing out my stater when I receive it in a few weeks, anything I should be looking at if the woodruff key is present? JC

    Comment


    • Bikerron
      Bikerron commented
      Editing a comment
      Any Yamaha v twin with that setup will experience the starter zing so it’s inherent. They’ll all do it.

      The woodruff key? No sir. Won’t even have to mess with it as the stator windings are bolted to the case cover you remove. The rotor is left alone.


  • #4
    Thanks Bikerron

    Comment


    • #5
      I dont get why those oil lines go thru that cover. Any idea? Sorry DH to hyjack your thread.

      Comment


      • Bikerron
        Bikerron commented
        Editing a comment
        Guess you’ll find out when you open it up.

        I’ve never been in there.

    • #6
      Replacing stator is easy enough job.. I was Going to address the potential starter spin issue but that was a lot more work and my bike is 20 years old with lots of miles so I left well enough alone. I wouldn't want to do all the steps to address the issues unless I had too... Pulling the cover and stator isn't a bad job to do again at some point.
      LET'S RIDE

      Comment


      • #7
        Originally posted by Jclevesque View Post
        I will be changing out my stater when I receive it in a few weeks,
        I'm not sure on the 1700's, but the 1600's had screws holding the stator. They are JIS phillips head. You may want to consider getting a JIS phillips screw driver or 2. They are in with some blue locite so they unscrew stiffly. Very easy to strip the heads with standard phillips screw drivers.


        Comment


        • #8
          JIS crosshead. Phillips (name) be damned on metrics. Just asking for trouble with those.

          Yea. The 1700s are the same.

          I cant remember if you’ll need the #2 or #3 tip size for those screws.

          The impact JIS drivers are the best.

          Vessel Megadora 980 Impacta P2x100 #2 Cross Point Impact Screwdriver https://www.amazon.com/dp/B003BI8HHQ..._KZilFbGRGQR3S

          Comment


          • #9
            Just use heat when taking those little screws out there pain in the ass. I use a micro torch for about 90 seconds on each screw head and they come right out
            LET'S RIDE

            Comment


            • #10
              Ok right on I have jis 2 and 3 impacta. Gonna check to see if there is a specific procedure to do this job. Just doing my due diligence I guess.

              Comment


              • Bikerron
                Bikerron commented
                Editing a comment
                Just be careful with the rubber grommet that passes the wires through the case and have fun with your gasket removal skills.

                The rest will be easy.

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