30mm oko carb what jet size to start with?

Discussion in 'Engine' started by blaster 0108, Jan 10, 2010.

  1. blaster 0108

    blaster 0108 New Member

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    here are my mods wiseco piston, boyesan reeds, uni filter, fmf pipe silencer , i'm getting the 30mm oko for a good deal what is a good size jet size to start off at ? and what cable do i need a have a twist throttle any help is appreciated thanks
  2. Braaaptor

    Braaaptor Member

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    Don't quote me here, because I run a 28mm Keihin PWK, but I believe the twist throttle cable designed to work with this carburetor will also fit the OKO. Motion Pro and Vito's both offer them.

    As for your jetting, I'd start around a 150 main with the needle in the center during this cold weather. See how the engine likes it. A 150 will probably run a bit rich and need to be dropped a few sizes, but its much better start safe and not wind up sorry. If you cannot obtain a good idle with the airscrew open at least 1/2 turn, you'll need go up one size on the pilot jet as well. Do your plug chops and tune from there. See sticky on plug chops.
    Last edited: Jan 11, 2010
  3. blaster 0108

    blaster 0108 New Member

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    a 250 ? wont that be too big i have a 260 in my stock 26 now and i dont really ride it much in the winter so i'm lookiing for a jet size for warm weather
  4. Knowpig

    Knowpig New Member

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    Keihin doesn't make a 260 main. He likely meant 150.
    But I would start with at least a 160 main.
  5. 2strokepower

    2strokepower New Member

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    no 150, look at my mods, i have a 155.
  6. blaster 0108

    blaster 0108 New Member

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    thanks man ! gonna start with the 150
  7. blaster 0108

    blaster 0108 New Member

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    anyone know what throttle calbe i can use with this carb and my twist throttle?
  8. 2strokepower

    2strokepower New Member

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    i dont know about twist throttles but i use a moose throttle.
  9. 2strokepower

    2strokepower New Member

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    and remember to do a plug chop after installing the new jets
  10. 2strokepower

    2strokepower New Member

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    yeah the 150 was dead on accurate and i had the same mods as you.I:I
  11. 1997blaster

    1997blaster New Member

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    didnt u blow up ur blaster? prolly not jetted right and both of u can have the same mod and be at the same place and still gave diffrent jetting i would start with a 160
  12. 1997blaster

    1997blaster New Member

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    if that is true then def start at a 260 or higher u gotta jet up in cold weather and it desnt matrter if u ride very much or not in winter just one ride with it lean and it could blow up
  13. blaster 0108

    blaster 0108 New Member

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    k ordered my carb anyone know what cable to use so i can order for a twist throttle ?
  14. blaster 0108

    blaster 0108 New Member

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    i ordered a couple jets i'm do plug chop to see which one is right
  15. 2strokepower

    2strokepower New Member

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    you cant put a 260 in a 30mm carb????? and no my engine dident blow up, my clutch did which made the kick start stuck. my top end looked fine. start with a 150 and do a plug chop i actually have this carb i know what jets you need.
  16. blaster 0108

    blaster 0108 New Member

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    how many turns should i start the pilot jet at?
  17. blaster 0108

    blaster 0108 New Member

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    i meant the air screw lol and will the stock pilot screw be good enough ?
  18. yb200

    yb200 New Member

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    1.5 turns and fine tune from there
  19. blaster 0108

    blaster 0108 New Member

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    k thanks also is the pilot jet gonna be he right size the stock on that comes with it that is
  20. blaster 0108

    blaster 0108 New Member

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    ayone know the cable i need to use with this carb for my twist throttle so i can order it thanks

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