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  1. #1

    rejetting 951 with flame arrestors ?

    I just bought some prok flame arrestors for my 98 xp and wanted to know what i need to change. i know i need to rejet the carb's but is there needle or seats to change too? What is recommended jetting as i'm at an altitude of 2300-2400 feet and where can i buy the jet's from. Thanks


  2. #2
    2001 XP PROKS W/ MILLER 155psi Head
    NO ACCEL PUMP

    MAIN=167.5
    PILOT=95 <<< NO ACCEL PUMP
    N&S= 2.3
    95 Gram
    P-Off=18~23
    HS=1
    LS=1 1/2
    _____________________________________

    XP PROKS W/ ADA 165psi Head 50cc DOMES
    NO ACCEL PUMP

    MAIN=167.5
    PILOT=95 <<< NO ACCEL PUMP
    N&S= 2.3
    95 Gram
    P-Off=18 ???
    HS=1
    LS=1 1/2

    ______________________________________

    JOSHE'S 2000 RX PROKS W/ STOCK 140psi Head
    NO ACCEL PUMP

    MAIN=155
    PILOT=100 <<< NO ACCEL PUMP
    N&S= 2.0
    65 Gram
    P-Off=17
    HSM= 3/4
    HSP=7/8
    LS=1 1/2

    _____________________________________


    947 With PROK F/A's
    USING Accel Pump

    MAIN=167.5~170
    PILOT=85
    N&S=2.3
    65 Gram
    P-Off=15
    HS=1/2 MAG and 3/4 PTO
    LS=1 1/2
    ____________________________________

  3. #3
    KrunchovXPL-GTX-RX's Avatar
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    The last one is my preference but with the stock N/S.

    Hey D,

    Remember when it was almost impossible to get anyone to post up jetting specs anywhere? I suppose this is what the 4-stroke revolution has brought us to.

  4. #4
    Jet spec. posting was voided on the "other site" because someone thought we were digging into their wallet and revealing "their" secrets [BS] --- Jet specs are all over the I-net,, not hard to find.

  5. #5
    KrunchovXPL-GTX-RX's Avatar
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    Brave new world...

  6. #6
    So where can i buy the jet's from and what's the advantage or disadvantage to using the ACCEL PUMP? So i just use the stock needle and seat? thanks

  7. #7
    SURFnTURF's Avatar
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    Quote Originally Posted by Billy98xp View Post
    So where can i buy the jet's from and what's the advantage or disadvantage to using the ACCEL PUMP? So i just use the stock needle and seat? thanks
    Where to purchase ??? I get my stuff here http://www.parkeryamaha.com/personal...raftparts.aspx
    but Im sure others will give you a better alternative.
    Disadvantages of not using the pumps are when you idle for periods longer than 20 seconds (approx) because you are using larger low speed jets it starts to load up with too much fuel and will chug a bit until you clear it with a stab of the throttle. With the stock low speed jets (smaller jets) it will idle all day without loading up with too much fuel.
    When you change over to a no pumps set up the throttle response is crisper and power is more linear as well as producing more torque which means you can run a taller prop or a lesser pitched prop with more acceleration.
    IMO is a better way to meter the engine fuel requirements.

  8. #8
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    Hey billy I recently ordered 4 jets for my XPl
    (2) 167.5 mains
    (2) 85 Pilots

    and got them deliver to my door for $14

    and YES they are GENUINE MIKUNI

    here's the link, they are very nice ppl to deal with, fast shipping too!

    Niche Cycle Supply
    2929 North Anvil
    SAINT PETERSBURG,FL 33710
    UNITED STATES
    (727)-3811151
    (727)-6479469

  9. #9
    Unless you are walking the razor blade of performance tweaking I would just leave the Acc. Pump as is. Without other Mods. there is little to no performance to be gained and a lot of frustration dealing with the Acc Pump if you dont know exactly what you are doing and have worked with it before. All Carbs. (on the same engine type) are a little different in this dept. and what works for one person will have having you constantly adjusting and tweaking for hours before you finally get it right on your Carbs--only to have it way out of Spec. after the next ambient air pressure change. Yes, it can be that sensitive. BTDT...

    Since we are on his web site, why not buy from his store ?


    --DvD

  10. #10
    A couple more question's
    do i change the needle and seat or leave alone
    and i should leave the accel pump on there?

    I have noticed that it does load up on me sometimes after i idle it and then gun it. Most of the time it pull's away clean but sometimes it seem's like it bog's for a couple of seconds and then clean's up.

    also what does the p stand for in those setting's?

    MAIN=167.5~170
    PILOT=85
    N&S=2.3
    65 Gram

    P-Off=15 <------------------------


    HS=1/2 MAG and 3/4 PTO
    LS=1 1/2

    Thank's for all the info everyone.

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