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  1. #1
    PWCToday Newbie
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    Aug 2017
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    SBN 44 Mikuni questions

    I am building my 650 x2 and am going to rebuild my carb. My question is, what size needle seat is the best for a slightly modded 650? I am wanting as much low end as possible. Thanks in advance.

    Mods include: polished intake mani, new pistons on .25mm bored jug, polished PJS exhaust mani, Mariner pipe, Mariner head, RCJS tri scoop, flat deck, blowsion stubby cone, dual cooling, shaved hood, d cut ride plate, 1.5 inch rear chop
    Last edited by ejolliffe; 10-22-2017 at 03:05 PM.

  2. #2
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: SBN 44 Mikuni questions

    Pop off pressure depends a lot on which flame arrestor(s) you are running. For free flowing Prox style flame arrestors most people are shooting a needle/seat and spring combination that yields about 17 psi. I prefer a larger needle/seat and heavier spring that gets me the target psi I am after.

    Pop off pressure chart is on page 15. http://www.mikuni.com/pdf/sbn_manual.pdf



    Home of Newmiller Machine

  3. #3
    PWCToday Newbie
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    Re: SBN 44 Mikuni questions

    Thanks mc, I'm running a hot products FA

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