2003-2005 Kawasaki JetSki Ultra-150 Factory Service Manual, Page 26Get this manual
GENERAL INFORMATION 1-21 Technical Information-Igniter
(4) Overheat Control To protect the engine against overheating, new, more sensitive heat-sensor constantly monitors exhaust pipe temperatureWhen temperature exceeds 90 degrees or more, the igniter gradually cuts engine speed to 500 rpm where it stays until the temperature is lowered