The MT-IGN-REV 99-02 RACER rev-limiter was designed for ALL 1999-02 Sea•Doo watercraft with 951cc R.A.V.E. engines only. (Carbureted Models ONLY) The Water Charts Below are to operate 2 solenoids. Water # 1 is designed for use in a headpipe and consult your after market pipe manufacture to see what is the best time to turn the water ON - OFF in the headpipe. Solenoid # 2 is designed for injecting water into either the pipe Stinger or the Waterbox at high Rpm’s.