Question about 1998 Yamaha Xv 250 Virago S

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Starts up good high idles misses messes around wont idle 11.5v while running. Voltage regulator? i spray wash this motor and this started happening thnxs

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Should be more than 11.5v,, more like 13v running. If this only happened after a bath, check all the electrical connections, unclip the plugs and blow compressed air on them to dry them out. drain the fuel bowl as well by unscrewing the small screw at the bottom of the bowl.

Posted on May 10, 2010

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Posted on Jan 02, 2017

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I have a 01 flht the volt meter reads at 11 volt a idle when I bring the Rpms up around 2 thousand the voltage gage reads at 14 cleaned all the conections had the battery checked it was fine any...


Whenever your rpms increase, so will the voltage out of your regulator. With the bigger bikes, they draw a lot of power at idle the regulator/stator wont charge the battery but rather keep everything else running during idle. Once your out of idle, then the stator sends more to the regulator which will then send more to the battery for charging (hence the more Voltage you are seeing). Hope this helps!

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Sounds like wiring problems. The air temp problem is a break in the circuit between the sensor and the computer. If you unplug the sensor the signal goes to the max cold reading.
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When starts idle to high?


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The voltage regulator should present 13.5 to 14.5 volts at the battery to charge it properly (engine at fast idle). I'm not sure if the V regulator is adjustable or not. If not, then it probably needs to be replaced. The alternator appears to be trying to do it's job, although it may have an open diode or winding if the alternator is 3-phase. An oscilloscope is the best tool to check for all three phases working properly. Good luck!

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