Question about 1999 Honda VFR 800

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When I check the voltage et the battery with the motor running it gives me a good 13.8 volts at about 3000 rpm, but I have a problem that after about 2-2.5 hours of riding I end up with a flat battery. I have a new battery in the bike and a new CDI, but it still happens. Can you suggest where to look for the problem ?

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Hi ,this might help.i think your voltage regulator might be kaput or your generator,,13.8v is the static charge of a 12v battery,with the bike running at about 3000rpm you should be getting between 14.2 and 14.8v,the way to test your voltage regulator is to put a meter across the battery with the bike running and switch your lights on the meter should dip momentarily then return to its normal reading if it is not reading at least 14.2v with the lights on the regulator is faulty,,hope this helps

Posted on Jul 31, 2009

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