Stator Low Output at High RPM
Close
    
    
Results 1 to 10 of 10
Like Tree7Likes
  • 1 Post By arbolmano
  • 1 Post By KeysRyder
  • 1 Post By scotti158
  • 1 Post By theedge900
  • 1 Post By littletommy
  • 2 Post By littletommy

Thread: Stator Low Output at High RPM

  1. #1
    Member KeysRyder's Avatar
    Join Date
    May 2015
    Location
    Florida Keys
    Posts
    43

    Stator Low Output at High RPM

    I just got my TW last friday, and have been working the bugs out of it and need to know if this is normal.

    It does not have a battery in it right now (it is coming just not here yet). Just been kick starting and riding. One thing I notice is when I rev the engine the lights dim. Everything works fine at idle. But when the rpms go up all lights dim. Just need to know if I need to think about getting a replacement regulator/rectifier.

    Thinking it may be the coil drawing all the power as it fires faster, that is the only other thing I can think would cause the lights to dim.

  2. #2
    Senior Member arbolmano's Avatar
    Join Date
    Feb 2012
    Location
    Arroyo Grande, Ca
    Posts
    782
    What year is your unit? There are at least three different charging systems. 1987 being the oddest.
    I would agree it's sounds like coil draw. Those systems use the battery as a power sink any over current produced
    goes to the bat ray. I'd wait on any conclusions until I had a bat ray and use a meter to measure voltage output.
    TWilight likes this.
    Tonto on the "Left Coast"
    1987 TW200 (2) 2015 BMW F700GS
    More Wagging and less Barking
    "Enjoy yourself, it's later than you think"
    Make Love not War

  3. #3
    Member KeysRyder's Avatar
    Join Date
    May 2015
    Location
    Florida Keys
    Posts
    43
    It is a 1990. I was planning on waiting until I put a battery in, just thought maybe it was totally unusual. Anyone know the amp output of the 90?
    TWilight likes this.

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member scotti158's Avatar
    Join Date
    May 2013
    Location
    Groton, NY
    Posts
    2,663
    The ignition system is totally separate from the charging/electrical system on these bikes, so it can't be "coil draw". Get the battery in it then go from there.
    TWilight likes this.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  6. #5
    Junior Member theedge900's Avatar
    Join Date
    Sep 2012
    Posts
    13
    My 98 did the same thing when my battery was completely dead. Replaced the voltage regulator and no change. Put in a new battery and back to normal.
    TWilight likes this.

  7. #6
    Super Moderator littletommy's Avatar
    Join Date
    Mar 2013
    Location
    Spokane, Washington
    Posts
    17,283
    Rule No. 1 Always start with a known good battery before testing electrical systems on your bike or you can get false reading just like this.
    TWilight likes this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  8. #7
    Junior Member xrdude's Avatar
    Join Date
    May 2015
    Posts
    2
    I dont know about the tw specifically but in my xr the regular/rectifier stablizes the voltage so it won't shoot up and fry your system when your rpm is high. In my friends tw, I noticed that the light is very dim on idle and brightens significantly when you rev it. If that were to happen on my bike it would indicate a bad battery or a bad regulator. I'm wondering if that's normal for a tw?

  9. #8
    Super Moderator littletommy's Avatar
    Join Date
    Mar 2013
    Location
    Spokane, Washington
    Posts
    17,283
    It's normal. At least in my case. Welcome to the forum XRDUDE!
    xrdude and TWilight like this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  10. #9
    Junior Member xrdude's Avatar
    Join Date
    May 2015
    Posts
    2
    Thanks tommy.

    As far as the op's q, I agree with others that you can get no accurate reading without a good battery installed. And again, I'm not familiar with your bike, but on my bike, riding without a battery puts a lot of stress on the regulator and could cause it to go bad, especially if you have a high wattage headlight and other add-ons. Let us know what happens.

  11. #10
    Super Moderator littletommy's Avatar
    Join Date
    Mar 2013
    Location
    Spokane, Washington
    Posts
    17,283
    Mine is an 87 with the tiniest electrical system Yamaha made for the TW. My lights are dimmer at a low idle, but it's normal and I don't worry about it at all nor do I expect any problems. I don't know how the other years functioned, since they beefed up the electrical system after the first year.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

Sponosred Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. stator and rectifier
    By 671tdub in forum Technical Help
    Replies: 6
    Last Post: 05-29-2013, 10:25 PM
  2. Charging system output
    By TWMike in forum Performance and Customization
    Replies: 1
    Last Post: 05-12-2012, 08:23 AM
  3. need c.d.i. and stator for 88 tw
    By ranger11 in forum TW200 Classifieds
    Replies: 5
    Last Post: 04-18-2012, 05:26 PM
  4. Stator output
    By san_mas in forum Technical Help
    Replies: 15
    Last Post: 11-16-2011, 11:45 AM
  5. Bad Stator????
    By dbreinich in forum Technical Help
    Replies: 5
    Last Post: 03-14-2011, 12:15 AM