750 ss xi Coffman exh cooling
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  1. #1
    Resident Guru DamageInc's Avatar
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    750 ss xi Coffman exh cooling

    Anyone have Intel on ideal cooling route for a full Coffmans exhaust for a 750 ss xi suit down?
    It has Coffmans exh mani, head pipe, chamber, and w/b. Pump is tapped for dual cooling.
    I noticed 3 openings on the w/b...2 on top, and one on the side facing chamber. What are these for? Any of them require a water fitting for sound dampening or cooling?
    Also, I've got a 46mm mikuni with 150h/120L jets. Will they need to be changed?
    Has Newmiller milled head, (currently being done) but should be in the 175psi neighborhood...

    9/17 big hub as well...

    Thanks gir any info
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  2. #2
    Resident Guru DamageInc's Avatar
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    Re: 750 ss xi Coffman exh cooling

    No one...?
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: 750 ss xi Coffman exh cooling

    Dual cooling from the pump = two lines should come into the manifold. You will then have two lines out from the head. One will feed the pipe, and the 2nd can go straight overboard to a water by pass fitting.

    Fittings on the water box are for water injection for tuning / sound. If you want, you can inject water here from your 2nd fitting on the head. I would try without first though.

    Jetting on your 46 should be good. You want a 2.3 needle and seat with an 80 gram spring.
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