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How to replace the stator & Manuals

Discussion in 'The Garage' started by a1steaksauce, Jul 5, 2019.

  1. a1steaksauce

    a1steaksauce XS400 Member

    I can't find anything on the Haynes or Yamaha service manuals and was wondering how I would replace a stator. I am willing to buy the Chilton/Clymer manual if they have information on this and was wondering if anyone knew if they had info on changing the stator. (I have an SOHC 1981)

    I also don't know which part I am supposed to buy when replacing the stator.
    Am I supposed to change the coil like this one-

    https://www.ebay.com/itm/80-YAMAHA-...:TOAAAOSw5wJdGtcq:sc:USPSPriority!97202!US!-1

    and do i have to buy a new field coil as well?

    https://www.ebay.com/itm/80-YAMAHA-...:7DAAAOSwjcVdGtcq:sc:USPSPriority!97202!US!-1

    and a new pickup coil? and/or rotor?
    https://www.ebay.com/itm/80-81-Yama...654142?hash=item4405b6fb7e:g:C10AAOSwjDZYdTz1


    Also are any of these parts not interchangeable within the SOHC xs400s? and are there parts that are interchangeable with DOHCs?
     
  2. NewHavenMike

    NewHavenMike 1976 XS360C Top Contributor

    Take the side covers off the engine and replace what is needed.. drain oil first.

    Theres tests you can perform to see what is good and bad. Get a voltmeter and learn how to use it, they are absolutely critical for diagnosing electrical problems. You will get no where without one
     
  3. a1steaksauce

    a1steaksauce XS400 Member

    Yes I took notes on how to test everything and have a multimeter. However, I was wondering if I'd need the flywheel puller to replace certain parts and if I needed to watch out for certain things that could fall out/ need to be noted/readjusted etc while taking off the cover
     
  4. BBS360

    BBS360 XS400 Guru Top Contributor

    Field coil is fully compatible across models:
    https://www.partzilla.com/product/yamaha/4R4-81660-50-00
    Stators did have some different versions:
    https://www.partzilla.com/product/yamaha/3F9-81610-50-00
    Some earlier models had a fourth output wire, later models don't use it. Should mean that your bike will take any year's stator. The fourth wire won't do anything.

    Replace whatever won't pass the multimeter tests in the manual.

    The pickup coil is an ignition component and unrelated to the charging system.
     
  5. BBS360

    BBS360 XS400 Guru Top Contributor

    I haven't read the Clymer manual but I don't think it would go into detail on replacing the stator.
    Easy procedure though. The stator and field coil are both bolted inside that side engine cover. Careful with the wire and wire grommets. You'll need some liquid gasket to reseal around the wire grommets.
     
  6. a1steaksauce

    a1steaksauce XS400 Member

    Thanks a ton, all of this was extremely helpful. Also when you mention that certain components are cross-compatible do you mean within the SOHC and DOHC categories? I would assume so but just wanted to make it crystal clear because the DOHC parts are quite cheaper.

    Also I wouldn't have known about the liquid gasket and that is quite helpful. thanks a ton!
     
  7. BBS360

    BBS360 XS400 Guru Top Contributor

    Almost nothing is compatible between SOHC and DOHC bikes.
    Check the partzilla links. They list cross-compatible models for each part #.
     

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