Now that we have hopefully convinced you NOT to use ether to start your Kubotas, what are you going to do with the cans of ether you have lying around?
Don't be like me, who saves everything in case it might come in handy. Pure ether as used for anesthetizing animals becomes explosive due to peroxide formation in the can, so just banging the can will cause an explosion. Starting fluid as obtained from an auto parts store is not usually all ether and has a stabilizer to prevent peroxide formation, but the gases it contains if the container leaks are all highly flammable (after all that is the point of it). If the vapors reach something that creates a spark, the flame can flash back to the can and also cause it to go boom. So store if you must in a well ventilated area, spark free. Preferably dispose of unused ether/starting fluid according to local regulations. This "might" be as simple as taking small containers outside and taking the lid off. Do NOT flush it!
In the lab we had explosion proof refrigerators and grounded explosion proof solvent cabinets, but no such stuff at home.
Betting torch and skeets and a couple others can add or correct here.