However, gas engines need to have their fuel system drained for extended storage, and having a shutoff valve on the carb is an easy way to burn off the excess fuel at the end of every gig. That's what I do with my lawn-mower and house genny, and it works great. I throw in some Sta-Bil fuel additive if it won't be run for more than a month, burn-off the fuel out of the carb if I won't be running it the next day, and call it done. Or am I making this too simple?
I can reference only what multiple sources (oil distributor, motorcycle shop, riders) that when putting a motorcycle away for the winter, fuel should be drained, and run out (tank should be able to evaporate any condensation that will form) oil should be changed to get rid of any acids and other combustion byproducts from the oil, and battery put on a battery tender. Taking it out of storage, oil should be changed AGAIN, as condensation during the winter months will have formed in the crankcase and contaminated the oil. Fresh fuel, check running gear and fire it up.
I don't do that. I don't buy into the oil change every 3K miles - owners manual doesn't require that. Oil gets changed with tire changes (between 8K and 12K miles) fuel gets Stabil if it will sit more than a week (methanol in the fuel evaporates/breaks down very quickly), and try to park it with nearly a full fuel tank (my tank is plastic so condensation is less of an issue). Same with the lawn mower (though the lube system on the engine is more primitive, and the tires that never wear out)
Seals will dry out when an engine is not used, and rust can form (in extreme cases seizing the engine) especially if exhaust or intake are subject to water penetration. Hoses, belts, and other rubber parts will deteriorate at about the same rate whether the engine has been
run or not.
Diesels are particularly sensitive to water in the fuel - diesel injectors / mechanical injector pumps operate at extreme pressures, and need ultra-tight tolerances to build that type of pressure. What appears to be minor pitting in the surfaces result in non-operational or poorly operating injectors. Watch for condensation, and service the fuel/water separator religiously.
Don't forget belts. Our very big quasi-government business had an entire COOP (Continuity of Operations) drill ruined as the generator for the main management/IT site threw a belt in the first 10 minutes of the drill. No com. No computers.