Do you know why the Onan Manual suggests that you start and run the APU one a month? There are two very real reasons and neither has anything to do with the health of the machine.
Reason 1 - The manual was copied from a WWII edition and the techincal writer that got the job doesn't have any experience with engines and generators and such.
Reason 2 - It was written by the people that sell the parts that will need replacing sooner with this practice.
The thing about drying out the windings is most of a century out of date. The varnish that the windings are coated with in recent (last 50) years is not at all hydroscopic.
Running the machine too much is a poor substitute for draining the fuel system. Learn to do this and you will never have trouble with the carburetor again. That is unless it is so old it is not compatible with current crapahol sold as motorfuel. You can have any small engine shop swap in fuel line and carburetor parts that are.
Matt
