Re: Engine warm up
Five minutes seems excessive to me, especially with an air cooled engine that has no means of cooling itself. No internal cooling fan, no shrouds. To leave one sitting for five minutes without air passing over the cooling fins sounds like it could do more damage than good.
I take my cold engines down my driveway, fire them up and idle down my street with the choke half or less on then open the choke and ride. Less than one minute of engine running time. That goes for summer or winter. Many many miles later, no problems.
What works for some might not be the answer for everyone. Just one man's opinion and experience.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"