battery

1975 Commando MK III: First test: - Leads from the alternator disconnected - Engine running at 3000 RPM - Voltage across leads =~ 25 VAC Second test: - Almost new battery - Alternator leads plugged in - Engine stopped - Voltage at power outlet =~ 12.8 V Third test: - Engine at 3000 RPM -...

Hi, I tried to start my norton after some work on it. Spark plugs are good, carb freshly cleaned up. I got spark, but the kickstart kicks back. My battery shows 11.9 volts after 2 minutes with the headlight test. Should I change my battery? Thanks! Phil