The other day my BX started killing the engine when I would move the H-N-L lever to low or high. after wiggling it back and forth sometimes it would start, but would cut in and out when moving the tractor around. Pulled the right tire and adjusted the safety switch, but the problem persisted. So today I went to the local Kubota dealer and picked up a new K1122-62250 switch, pulled the rear tire again and installed the new switch. Works fine now, no problem.
The old switch didn't feel the same as the new one when you pushed the plunger in, so it looks like the problem is solved. When the dealer gets another of the switches in, I'm going to change the PTO safety switch also, just as a precautionary measure.
A car tire dolly works great to remove and install the loaded rear tires, those buggers are heavy to manhandle on and off.