Small Pin 750SS, dual carb, coffman exhaust jetting

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  1. #1
    I dream skis bluffskier's Avatar
    Join Date
    May 2006

    Small Pin 750SS, dual carb, coffman exhaust jetting

    Hi, I'm redoing some CDK-2 dual carbs for my friend and was wondering what the jetting should be for the Coffman pipe. It's a silver pipe, i read they made a Hurricane and Rocket pipe. The jets in there now are like a 42,72, and I think a 142, don't really remember off the top if my head, also, what is the pop off supposed to be at?

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  2. #2 Is My Home Away From Home fastgtfairlane's Avatar
    Join Date
    Apr 2010

    Re: Small Pin 750SS, dual carb, coffman exhaust jetting

    im running a ssxi engine with the 3 jet keihins. i believe stock is 72,42,142 like you listed. popoff stock i believe i measured 30-32psi. im running the stock rectangular arrestor with both side grommets removed as well as the thinnest screen inside. i had to lower my popoff( shorter spring in the rebuild kit) 20-22psi and rejet the carbs to 78,50,145 to get it to run right. im running a westcoast pipe and running the engine in a 550 hull. this was on a fresh rebuild with all new seals, pistons and passed a leakdown test.
    Last edited by fastgtfairlane; 02-22-2018 at 05:42 PM.
    91 440; PJS Viper 7000, jetsport exhaust mani, factory full pipe, coffman waterbox,solas 17*, jetco worked 440 pump, ocean pro nozzles. shredmaster ocean rideplate and grate combo, wide tray, footholds, deep strake mod, driveshaft fill,650sx quick turn

    build thread part 1:
    build thread part 2:
    build thread part 3:

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