I always prefer to take a coil off a running motor Norm when an engine won't run if I have one as it saves time
if it doesn't run because you can then look else where for the problem.
I remember once when I had a Briggs Quantum that wouldn't run and I replaced the coil 4 times before
the coil was good and it ran again ,one coil was removed from a motor with a thrown rod and the coil
still didn't work.
I pushed the button and it smoked up the new starter solonoid so to check the comp I went back to jumper lead straight onto the starter motor
When I was a kid starting an old motorbike with a car battery I burnt out the starter wiring and the solenoid and thought it would do the same thing using a car battery on a mower, I remember asking an Auto electrician if a car battery would work on a mower or will it burn the starter circuit and he said the starter circuit only draws the amps it needs from the battery so it won't burn out the starter circuit .
As we know
A lot of the time if it starts quickly you don't have a problem with a car battery but there is still the chance that too many cold cranking amps in the battery will damage mowers and motor bikes. starting system.
Cold Cranking Amps (CCA): Car batteries typically have a much higher CCA rating than motorcycle/ mower batteries. As a result, they can deliver a lot more current than what the motorcycle’s / mower's starter and wiring are designed to handle. This excess current can potentially overheat and damage the starter motor, solenoid, or wiring.
Starter Motor and Wiring: The starter motor in a mower / motorcycle is designed for the specific demands of the bike's / mower's engine. Using a battery capable of providing more current than the starter can handle increases the risk of overheating, burning out the starter winding, or damaging the wiring and solenoid.
Potential for Damage: If you use a car battery for starting a mower / motorcycle, you may cause the starter motor to draw more current than it is rated for, leading to overheating and possibly burning out components.
Starting Circuit Design: The wiring and circuitry in motorcycles / mowers are usually less robust compared to those in cars. This means that the risk of damage is higher in a motorcycle's / mower's electrical system when using a higher-capacity battery.
Cheers
Max.
