I'm not understanding how a bike with a fully charged (and load tested) battery won't start using the starter motor, but will fire up by bump starting.
Some Information on this Subject.
A fully charged, Flooded Lead Acid Battery, is considered fully charged at 12.6 VDC.
An fully charged, AGM (Absorbed Glass Mat) Lead Acid Battery, is considered fully charged at 12.6 to 12.9 VDC, depending on the manufacture.
When starting the engine. The battery voltage is at, lets say 12.6 VDC. After the starter starts to rotate the engine. The battery voltage will drop to between 11 and 12 VDC. This is a normal voltage drop, considering the high amperage draw of the starter.
For the Ignition Coil to operate properly. The Battery Voltage at the Ignition Coil has to be 10.6 VDC or Higher.
If the Battery is Weak, below full charge status. The starter will still rotate the engine, to what the operator thinks is a fully charged battery. But the battery voltage at the Ignition Coil is below 10.6 VDC.
The engine doesn't start. So the operator, tries starting the engine again, so forth & so on.
So the operator tries a Push Start. The Push Start is a success, so the cbr and the rider is off on another Adventure.
is the Difference ?
is the Voltage
at the Ignition Coil
Even thou the battery was Weak
. By Push Starting the cbr, instead of using the starter, the battery voltage didn't drop below 10.6 VDC, at the Ignition Coil.
Maybe it's Time
about getting a DVM (Digital Volt Meter) ?????