Spare engine starter clutch check

The starter motor clutch on my KZ750 L3 (4 cylinder) is slipping badly. As you know, the starter clutch is buried deep in the middle of the block. I have seen descriptions of how to get to the starter clutch, and it looks involved.

I have a spare engine that I could just swap out with the current one but I want to make sure the starter clutch in the replacement engine engages and kicks the engine over before I switch engines.

Is there a way to properly hook up a battery to the starter motor to get it to turn the engine without damaging the starter or frying some other electrical component? Where to hook up the high tension lead? Where to hook up a ground lead? Is there a starter lockout mechanism that I have to locate and bypass?

I know this is a dumb question, but I don't want to drop in the spare engine and find out I have the same issue.

Id imagine a heavy gauge jumper would work to turn the engine over. Put the Negative (-) or Black lead to the engine block. This will connect to the negative battery terminal.

The Positive (+) or Red lead will go directly to the starter solenoid where the heavy gauge cable goes to the starter motor. No additional wirng is needed to tun the engine over. You might want to remove the sparkplugs and squirt some engine oil in as lubrication if the spare engine has been sitting for a while.

A battery from a car will work well as it has plenty of cranking power compared to a bike battery. Just make sure the car's engine is stopped.

If the starter clutch is good it will immediately crank the engine as soon as the starter solenoid terminal is touched with the Positive jumper lead.