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It's a new batt but may be bad if it doesn't keep at least 12.7-13.4. It does happen. Before it starts voltage drops so isn't enough to activate starter solenoid. Try riding longer. Have the batt load tested. Should be charging at 1500rpm enough, 3000 should be even more adequate.Check across batt terminals while running, check at idle and 3000rpm & more. You will see the input from charging system.Check voltage at the spade connector on starter solenoid when you hit start, it's most likely 9-10V