You'll know when a clutch spring breaks.
The spring breaks off, then wedges between shoe and clutch drum. You now have direct drive, no clutch.
You can still make it home. Just ride slow and make as few stops as necessary.
When you stop, the engine dies. You could prolly pedalstart the engine. In my case, I put the bike stand down, making sure the rear tire was off the ground.
After pullstarting the engine, I raised the bike stand, got the bike rolling, THEN jumped on the bike.
I kept doing this every time the engine stopped. You COULD jump off the bike before coming to a complete stop at a traffic light.
Lift the back tire off the ground with engine (and back tire) running. Then roll the bike and hop on.
It'll get you home with this method, because 460 engines are prone to breaking clutch springs, no matter which ones you have.
When I find clutch springs that lasts thousands of miles (like my Tanaka engine), I'll take my 460 off the shelf and put it back on my bike.