how did you run your cooling. the water is very cold so i monitor the engine temps with my handle bar warmers. I run an adjustable flow restrictor and adjust until it is too hot, thats when i dump it over board for the summer. my pipe i run seperate from the motor and it is not preheated so it always runs cool, i close all the screws except one, it is open about 1/16th of a turn and runs it almost dry. i never get it to sizzle.