Better to store bike or do idling warm up during a month of no ride

[Jim21680_imp]

Agreed...you might be doing more harm than good with the frequent 5-minute start-ups. During winter months here, I keep my bike in a dry but unheated garage, hooked on a battery tender. I start it maybe once every 2 months just to keep the internals coated with oil. Air cooled bikes seem to tolerate long-term storage quite well, even completely unattended to.

If you're forced to keep the bike outside with no access to power, I still think you'd be plenty okay for a month of storage, at least. A ventilated cover is always nice if you have one.