I put the tire warmer question to Dunlop and here's their reply:
Good morning Reg,
Thank you for taking the time to contact Dunlop Motorcycle & ATV.
Thank you for taking the time to contact us with your Dunlop motorcycle tire questions. If the ambient air temperature is above 60 F, then tire warmers are probably not necessary. If the temperature is below 60 F, then we recommend setting both the front and rear at 140 F for 20 - 30 minutes.
The use of tire warmers is basically just a confidence boost when you first start a race or riding session. It allows the tires to be warmer and grippier from the start. There is no problem with using them however in a track day situation.
I would recommend that you start off at a slower pace and then increase your rate as you and the tires warm up in
a lap or 2. If you are just starting out, I would also suggest discussing with more experienced riders to see what works for them.
Its kind of one of those black magic racing things that everyone thinks they have the answer to.
Should you need any further information or assistance, please call Dunlop Consumer Affairs @ 800-845-8378 or e-mail us.
regards,
Consumer Affairs
Dunlop Motorcycle & ATV Tire Division