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  1. #1

    Jetting specs that I have used

    1200 GPR single piper ported or not, Flame arrestors, Advent CDI Yam 84 Engine, No accelerator pump

    Stock, Novi modified, Prok Atomizers or RPM modified (Stock Bore)

    110 Pilots
    120 Mains
    1.5 N/s
    95 Gram Spring

    Buckshot modified stock carbs to 46MM Bore
    130 Pilots
    117.5 Main
    2.3 n/s
    95 Gram Spring

    For a Triple Piper 1200 add 20 to the main jets.


    1300 GPR single piper conversion (Ported), Flame arrestors, Advent CDI Yam 84 Engine, No accelerator pump

    Stock, Novi modified, Prok Atomizers or RPM modified (Stock Bore)

    115 Pilots
    135 Mains
    1.5 N/s
    80 Gram Spring

    BlackJack 48mm (SBN Core)
    120 Pilots
    100 Mains
    2.0 N/S
    80 Gram Springs
    Drilled out restrictors with a 90 main jet in the return line to equalize fuel pressure


    1300 GPR Triple Piper (Ported), Flame arrestors, Advent CDI Yam 61

    Novi 48MM Carbs

    120 Pilots
    135 Mains
    2.0 N/S
    95 Gram Springs
    Dual Check valves in the metering block
    Dual springs on Throttle to prevent dribbling at idle
    90 main jet in return line
    (External Mikuni Pumps)

    1400 GPR Single Piper Ported (87 Wiseco's)

    BlackJack 48mm (SBN Core)
    110 Pilots
    110 Mains
    2.5 N/S
    80 Gram Springs
    Drilled out restrictors with a 90 main jet in the return line to equalize fuel pressure


    All of this jettings will apply to ski's with V-Force III Cages
    Last edited by Fercho; 08-12-2007 at 08:40 PM.


  2. #2

    GP1300R Triple Jetting

    1300R Conversion Lightly Ported
    02/05 Entry prior to full porting ( Please note that the jetting for the TPP Ported 1300 that I posted above I ran at Mudbug and the ski was way rich, so that is my starting point and should pull strong)

    48 Novis
    115 Pilots
    125 main
    2.0 n/s
    95 gram spring
    1 1/8 turn out on the lows. 1 turn out on the highs
    3 Mikuni External Pumps
    200 Main Jet on Return line
    Dual check valves on metering block
    Pro-Tec intake manifold 93 Octane 32:1 fuel/oil ratio
    155-160 Cranking PSI
    Yam-61 Advent Curve

    Jay's Ported 1200R Triple piper with Novi 48's and External pumps

    115 Pilots
    125 Mains
    2.0 N/S
    95 Gram Spring
    130 Main Jet in Return Line
    155 PSI Cranking Compression
    Advent YAM 60 Curve
    Last edited by Fercho; 07-03-2007 at 08:32 PM.

  3. #3
    Moderator RX951's Avatar
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    Thumbs up Jetting Specs GP1200R GP1300R

    Great information to share Fernando !!!

    I can't imagine the hours you have from all the testing to dial in each one !!

  4. #4
    Moderator RX951's Avatar
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    Fernando Buckshot Jetting GP1200R

    Here are the jetting specs Fernando dialed in back in Feb 2002 for the GP1200R.
    I currently run this reverse jetting on the Buckshot modded carbs on my 12R. It hits !

    130 Pilots @ 1-3/8 turn
    120 Mains @ 1-1/2 turn
    2.3 N/S with a 95 gram spring
    pop-off checked at 17 PSI.

  5. #5
    cheatin' piston popper addicted's Avatar
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    Fercho,

    Any specs on a 1200 with a dplate and stock airbox?

    http://www.greenhulk.net/forums/showthread.php?t=37158

    Thanks,

    Mike

  6. #6
    Try 100 pilots 120 mains 1.5 n/s 95 gram spring

  7. #7
    Nando, what do you recommend for a 1300 with no to little porting, head, single pipe, stock carbs with F/A's and VF3.

  8. #8
    Bro I would go

    115 Pilots
    125-130 Mains
    1.5 N/s
    80 gram spring

  9. #9
    Moderator OsideBill's Avatar
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    Fercho I have a Lowell ported 1390 build in progress with 44 I body Black Jack conversion.

    Art Recommends

    110 lows 1 turn
    150 highs start at 1.5 turns and tune down
    2.5 N&S Black spring

    Your thoughts on this please.

    I am also building a 1300 rec ported motor and was considering running these on it and finding some 48's for the 1390 Art suggested only change the main to 145 if I run on the 1300

    Thanks as always O'sideBill

  10. #10
    Bill I will give you some beter specs in about a week. I got some carbs in Razzbo's 1390 XLT and I blve I am running 115 pilots 1.5 n/s 80 gram spring and 145 main jets. The holeshot has a slight bog it I let it idle that can be cleared by adjusting the lows. We still have not adjusted the carbs and we are a 2 turns out.

    On Lowell ported 1390 with SBM blackjacks I am running 110 pilots and 110 main 2.5 n/s 80 gram spring, restrictors drilled out with a 90 main jet in the return line. My best adjustment is 1 turn out in lows and highs

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