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1991 yamaha fzr 600

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  • 1991 yamaha fzr 600

    having a charging problem with a friends bike can anyone tell me why or what is the problem with keeping the battery charged so could any one tell me what could be the problem

  • #2
    Make sure the battery fluid are good in level, retest. If it won't charge, could possibly dead battery. Try another bike's battery just to rule out a dead battery...and then go to the wiring/alternator/fuses....


    • #3 lot's of Fizzer owners, also has a FAQ on the bikes.


      • #5
        voltage regulator is shot yammies have really sh1tty electrcal systems unplugs the stator genarator thing and the voltage reg start bike and measure then voltage coming out of the stator it shoudl be around 45 to 64 volts AC if not the stator is bad if this is correct then plug everything back in with bike off start again and measure voltage at battery at 3000rpm it should be around 14 volts if not its the voltage reg buy the newer one from an r6 with the black finned body one and there a diagram on the fizzer archives to tell you how to wire it. i had to do this same mod on a buddys 93 fzr.


        • #6
          what year r6 does it have to be for the regulator to work on the 91 fzr


          • #7
            when ever they started makeing them for like 98 to 05


            • #8
              Originally posted by sinfulkat
              voltage regulator is shot yammies have really sh1tty electrcal systems

              (Note this is a repost: the original post was written when the power went out a couple days ago during a bad thunderstorm and was never posted all the way)

              Yamaha has had problems with their voltage regulators for eons, mostly due to heat-build-up issues. Later voltage regulators with integrated heat sinks on the backside work much better, but may need to mounted somewhere other than the original location because of the change in size and to permit more air to draft over the heat sink itself. The replacements run $35 - $42 commonly, and the parts counter guy at any Yamaha-only dealership should immediately know what you need as a replacement with the heat sink included; it's a very common issue on wide variety of their bikes.

              KNOW THIS:
              most of Yamaha's motorcycles are built in such a way that they do not have a positive electrical output at idle, but only after the RPM's rise. Yamaha does this to permit use of lighter-weight alternator/stator/generator (whatever you care to call it), which helps keep the cost and total weight of the bike down. On the other hand, if you find yourself in a traffic jam with the headlights blazing and the fans running while the bike is sitting at idle, it's sucking your battery dry. It's also a common issue with many sports bikes by various brands where weight/size is more critical than raw reliability as a daily commuter.

              You might want to read this indepth write up about voltage rectifiers at the Fy6t5p0 board:

              =-= The CyberPoet
              Remember The CyberPoet