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  1. #1

    Join Date
    May 2007
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    oem carbs or novi

    xlt 1200 turned 1390 will i see a huge night and day different with the novi also what recommened reeds vf3 or boyesen


  2. #2

    Join Date
    Apr 2008
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    I switched from stock modded carbs to Novi's....Night and day difference, i learned start BIG and do it right the first time.

    I cannot comment on the VF3's though. Never had em.

  3. #3
    Moderated
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    Oct 2006
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    novi's + vf3's on a 1390 = epic win.

  4. #4
    krispaintballz's Avatar
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    There is nothing wrong with a really good stock carbs setup. This would mean choke plates removed, primer install, tamper caps removed, T-handles installed, accel pump removed, returns drilled, and restrictor used. Switching to novis will give you at most 1 mph more. A good stock carb setup will give you great results. The bigger novis will give you a little more but again they are BIGGER. With that said I run 48 Novis.

    Vf-3 reeds give big gains in snap and quickness compared to any reed on the market for the gpr. With saying this I did NOT see much gains with the vf-3 reeds on a GP setup.

    Moto tassinari get these results by incorporating more reed petals per reed cage. This allows the same to more air flow with the reed petals opening only half the distance. This allows them to close and open faster.

  5. #5
    All hail the Chief! fullboogie's Avatar
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    There are many people with big speeds (and great throttle response) running stock carbs. Hard to justify the huge expense of Novis unless you just have to have them.

  6. #6
    Moderator OsideBill's Avatar
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    On the OEM carbs do they have posted proven jetting specs for a 1390 motor? and what type of motor Lowell, TJ or GroupK? I have not seen much on this and am still working with a couple guys on Lowell ported 1390's. The groupK motor jetting is known.

  7. #7

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    yes stock carbs will work. I had them on 1300 triples and worked fine.

    Switched to Novi's and it was night and day difference! Can't beat the punch.

  8. #8
    Moderator OsideBill's Avatar
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    Quote Originally Posted by YamahaPat View Post
    yes stock carbs will work. I had them on 1300 triples and worked fine.

    Switched to Novi's and it was night and day difference! Can't beat the punch.
    How about on a 1390 though? lots of proven 1300 specs out there.

  9. #9
    zx11rider's Avatar
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    i would think the 1390 needs the big carbs for more fuel to get its full potential.

  10. #10
    My 1500 single has stock carbs(modded)

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