Hi There,
9 out of 10 times it is loose battery terminals, corroded terminals. - Clean and tighten.
TEST:
Test your volatge regulator by attaching a voltmeter to you battery:
With bike off battery meter should read 12.50 +/- .25 volts - anything lower-battery needs charge
With Bike on at idle meter should read 12.80 +/- .25 volts - anything lower-voltage regulator bad
Rev to 2000 rpm meter should read 13.75 - 14.80 volts - anything lower-voltage regulator bad
Before replacing the voltage regualtor make sure the groung wire from the voltage regulator is tight and recheck with the meter.
Check your ignition wire screws, one may have vibrated loose. - Inspect / check for tightness
Check that wires connected to coil are tight .
Most of the time its just a loose connection. Find and tighten.
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