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  1. #11
    spud's Avatar
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    We are looking forward to hearing your results Fercho.

    Art set up my OEM modified to Black Jack 48's and jetted them:

    110 pilots

    2.5 N&S Black 80 gram springs

    150 main jets

    This is to go on a Lowell ported 1390

    I don't know anything about Blackjacks so I am really interested


  2. #12
    Razzbo wil be working straight for 2 weeks so I will have to wait till then

  3. #13
    Moderator RX951's Avatar
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    I've ridden Razzbo's XLT1390 w/Blackjacks...all I can say is tha it HITS ! and its still running rich.

  4. #14
    We need to reinforce that pump tunnel somehow.!!!
    Quote Originally Posted by RX951 View Post
    I've ridden Razzbo's XLT1390 w/Blackjacks...all I can say is tha it HITS ! and its still running rich.

  5. #15
    spud's Avatar
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    Can we condense this information and make it a sticky, or just make it a stick in the how-to section? I plan to add when the BJ 48 "I" body conversions are dialed in.

    Jetting that has worked very well for me with Fercho's recommendation:

    Lowell ported 1300, single pipe, stock carbs, Prok F/A's, Advent Yam 59

    115 pilots

    2.0 N&S 95 G springs

    135 mains

    Lows 1 turn out

    highs 1.5 turns out


    Stock 1200 choke plates in:

    110 pilots

    1.5 N&S 95 G springs

    120 mains

    Lows 1 turn out
    Highs 1.5 turns out

    Stock 1200 choke plates removed

    110 pilots

    1.5 N&S 95 G springs

    125 mains

    Lows 1 turn out
    Highs 1.5 turns out

    Lowell Ported 1390 single pipe, Blackjack 48 I body carbs, Prok F/A's

    Update: I ran the 1390 at Senator's Wash today. The ski ran great the water level was too low to get any runs in much over 1/4 mile. Temp was about 75 degrees

    115 pilots

    2.0 N&S Black springs

    150 mains

    low screws 1 turn out

    High screws 1 1/2 turns out.

    Ski was crisp and accellerated very hard. There might be additional fine tuning, but this works good.
    Last edited by spud; 03-02-2008 at 12:08 AM. Reason: update to 1390 ported BJ 48 jetting

  6. #16
    Hydrotherapy's Avatar
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    Quote Originally Posted by VOODOO View Post
    Nando, what do you recommend for a 1300 with no to little porting, head, single pipe, stock carbs with F/A's and VF3.
    any ideas for 1300 not ported with d plate and 150 psi head 1200 timming stock reeds,stock carbs with flame arrestors

  7. #17
    WE DONT DIAL 911 RDH's Avatar
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    Quote Originally Posted by Fercho View Post
    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


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

    should i keep the same 95 gram spring for triples or go to the 115 ?

  8. #18
    spud's Avatar
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    I updated an earlier thread to include what I believe to be good Lowell ported 1390 jetting.

    That ski is pulling like a freight train.

  9. #19
    Are the jetting specs provided here still valid? I have a ported 1300 w/Novis I'm ordering jets for.

  10. #20
    cmherrera's Avatar
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    same here

    what jettings, 2000 GPR Novi 48, LH ported 1300 single pipe with jetwork mod, Advent yam 84, Head 150psi,IR case porting, VF3's with spacer, fly F/A.Did I miss anything

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