Electrical fault on yamaha virago

SOURCE: 200 YAMAHA V-STAR 650 HAS

IT sounds like it is the pickups not working (.telling it to spark) if not then it will be CDI UNIT OR ENGINE GENERATOR COILS

SOURCE: Won't idle without choke

The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

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SOURCE: yamaha virago 535 not charging on new battery and

Hi and welcome to FixYa,

Charging problems could either be a stator issue or a failed rectifier/regulator combo. To check:

• measure the battery voltage with the engine off;
  
• start the bike and measure it again, it should be slightly higher;
  
• rev the bike, the voltage should rise as the RPM increases;
  
• measure the voltage by pairs on the 3 white wires from the stator;
  
• there should be AC voltage that increases as the RPM ncreases.
  

SOURCE: Yamaha TW 200 starts but won't run.

If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

SOURCE: Can a voltage regulator/rectifier if not working

YES!
Good link here:
http://www.flygenring.dk/yamaha/artikler/1100ChargingSystem.pdf

Symptoms:
Lights flickering at times and/or battery gets hot to the touch

Problem:
Reglator/Rectifier

When the regulator dies, it allows as much as 19 volts to appear across the battery. This is not good. It will cook the battery and the battery could even explode. Fuse can not stand up to this!