xs650 need to have the comp to run?

Crosleyguy (Chuck), you might have a weak trigger magnet on the rotor. Do a forum search on "rare earth magnets", and see if the symptoms/solutions in those threads make sense...
 
Quick check for what 2M mentions is try running it for a bit with the voltage regulator unplugged see if it will rev then. measure coil primary and secondary resistance. Have the plugs been replaced? check plug caps.

then; check for correct main jets, leaky floats, bad float seal o-rings, holed or torn diaphragm. correct assembly of the jet needles into the CV piston.
 
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