SBT Jetski Engines, Parts & Accessories

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  1. #1
    Jul 2005

    Default Spark Plug Heat Range

    I notice at several websites that 1992 & 1993 Sl650's are recommended to take a champion RN-2C plug. The Selomarine manual says the original plug was an RN-3C plug (which I understand is a hotter plug).


    I've been to NGK & Champion but can sombody explain how heat range would affect these models (92/93 Sl 650's).

    Also, what heat range should I go with? ie) What plug?

    And - what does the original specs from Polaris state (and were there any deal advisories)?

    Last - Its always best to go with a cooler plug from a safety perspective (engine damage etc I'm told) but what would a hotter plug translate into out on the lake while riding?



  2. #2
    Jul 2005

    Default Re: Spark Plug Heat Range

    sorry that was supposed to say dealer advisories or dealer service bulletins

  3. #3
    May 2005
    uniontown, oh

    Default Re: Spark Plug Heat Range

    my 1995 slt750 had a nkg bpr7es plug in the manual but the service bulletin says go with a bpr8es because gas conditions have changed. so go with a number up from what yours was supposed to take when it was new. hope this helps

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