Question about 2002 Yamaha YZF-R1

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Electrical problem I have put a new battery in my bike. I have tested the electrics and fuses under the seat and all are o.k. The bike is draining the power from the battery. I can jump start the bike and it will only ride for approx 3-5 minutes and then the bike shuts down? Is there a dyno? If the battery is fully charged the bike will slowly drain the power and the bike will shut down whilst riding it.

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  • gary_crawfor Dec 15, 2008

    Thanks for the info: I have been away working so I have only got to my bike today. The only item that looks like the above is under the seat in the electricals with alot of wires? Its Mitsubishi Electrics and has only 1 long section and not 2 like the above picture. Where is this part located? I'm hoping for some mor info if possible.

    Thanks Gary



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Hi and welcome to FixYa,

Initially, pls try recharging the battery again. Remove the connector to the voltage regulator. Start/run the bike. If it lasts more than "3-5 minutes" then you have just confirmed a defective regulator. The voltage regulator would look something like below image.
Electrical problem - eb8e29b.jpg
This page may give you additional insight.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 25, 2008

  • Louie  Role
    Louie Role Dec 15, 2008

    Below are images of regulators used by Yamaha:


  • fudge77 Sep 13, 2010

    Try measuring the resistances of the stator plate coils.I had this problem with mine also check the engine oil has not turned black very quickly ,burnt out coils on the stator plate can cause this ,and go purchase a Haynes manuel its a BIG help.



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In order to determine where your electrical drain is while your bike is off, replace the 30 amp main fuse back into the starter relay, and pull fuses from the fuse box, one at a time. Let your bike sit, for however long it takes to drain your battery, to determine what system is draining your battery.

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