2004 Polaris Touring Service Manual, Page 296Get this manual
ELECTRICAL Detonation Elimination Technology (D.E.T)
Some units are equipped with detonation sensor that monitors the engine and responds to detonation by automatically reducing the engine timingWhen activated, the "DETONATION FLASH" indicator (A) will flash in the lower right-hand area of the tachometerThe activated sensor reduces engine detonation by retarding the ignition timingThis results in decreased engine RPM and performanceThe detonation system is not always effective at sensing engine damaging detonation and protecting the engine under hot ambient conditions or conditions where the CDI box temperature is elevatedUnder these types of conditions it is especially important to follow the jetting charts for temperature and altitude that are recommended for your engine