Full exhaust jets and pilot screw settings
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Thread: Full exhaust jets and pilot screw settings

  1. #1
    Junior Biker
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    Full exhaust jets and pilot screw settings

    Hello people
    I am about to install a full dic exhaust on my bike. It is an mc22 RRL
    At the moment i am running stock headers with a faddy daddy exhaust.Stock jets and pilot screw settings #102 #105 1+3/4 turns out
    Bike is running fine
    What setup should i start from with the full exhaust and a uni filter installed?
    I am thinking to turn the pilot screw at 2 turns out..would that be enough or too lean?
    Also i have to side a set of #110 #112 jets from an mc22 RRR.Should i put those in? and how many turns out should i start with?
    Anybody had a similar experience to guide me?..i would really appreciate it
    Post your setups though
    Thank you in advance

  2. #2
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    Quote Originally Posted by jobi View Post
    Hello people
    I am about to install a full dic exhaust on my bike. It is an mc22 RRL
    At the moment i am running stock headers with a faddy daddy exhaust.Stock jets and pilot screw settings #102 #105 1+3/4 turns out
    Bike is running fine
    What setup should i start from with the full exhaust and a uni filter installed?
    I am thinking to turn the pilot screw at 2 turns out..would that be enough or too lean?
    Also i have to side a set of #110 #112 jets from an mc22 RRR.Should i put those in? and how many turns out should i start with?
    Anybody had a similar experience to guide me?..i would really appreciate it
    Post your setups though
    Thank you in advance
    use the search feature...


    tune

    Basic tuning. Setting pilot screws. Avoiding Rich, Lean etc.

  3. #3
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    that was really helpfull! thank you

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  5. #4
    Biker Slipry's Avatar
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    had dic full system from a mc19 on mc22 rrL

    open airbox with unifilter and "long type" trumpets

    2 1/2 turns out on each

    112 jets on all carbs

    using the "tune" guide found increasing the clip high just added hesitation from primaries to mains - this is where you will have your biggest issue - getting the smooth transition. rather than add clip height i found just richening the primaies was more affective.

    every bike is different though - i ran it with no airbox restrictions to tune and just adding the unifilter caused a hesitation at 6500 rpm.

    dont think you can do it in a day - took me about a month of in the seat tuning to get it "close enough" to just right - dyno if you can

    if its your only transport i'd consider leaving it stock - the benefits are there but of no great substance

    EDIT: get new carb boots before you start too - aint expensive and will take out one annomoly
    Last edited by Slipry; 24th June 2016 at 12:47 AM.
    Quote Originally Posted by schultzy View Post
    I stuck a battery up my arse.
    Yeah, that's a cool story...

  6. #5
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    So you suggest leaving the needles as is with 1 0.5mm washer and just richen it by unscrewing the pilot screw and putting in the #110 #112 jets
    The airbox restriction is the piece with the 2 round holes in the airbox right under the filter?
    I wont mess with the trumpets and the restriction.I'll just add the unifilter in place of the stock and the full exhaust
    So i supose my job will be easier
    I do have another bike for everyday transport so i dont care about that.My bike runs great as it is now but i found the full exhaust cheap enough and i fell in love with the looks and the sound of it!
    3 months ago i rebuilded the carbs..new boots,float valves,perfect cleaning an synchronizing

  7. #6
    Senior Biker Lane's Avatar
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    I would start with 115 jets in all four and an extra 0.5mm washer under each needle.

    If you have bought the Unifilter already then run with it but I wouldn't bother if you haven't, paper filters flow more than people think and messing with the inlet is much harder to tune than free flowing exhausts.

  8. #7
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    I havent bought the uni filter yet.
    My plan is..install the exhaust and go for a ride without touching anything else.Then check the plugs.If it is too lean i will give an extra quarter turn on the pilot screws
    Ride again check the plugs..if it is still lean,carbs out,add an extra washer and the bigger jets.
    I will leave the air filter stock for now
    Right now with the stock settings,balanced carbs and a slip on exhaust,i feel the bike perfectly linear

  9. #8
    Senior Biker Lane's Avatar
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    To do a proper plug chop you need new plugs and to be flat out in a high gear under load for an extended period then switch off bike immediately while at high revs and then inspect the plugs.

    It's a crude way of checking especially on four strokes.

    Your pilot screws will do little to affect the tune except at idle and at very low throttle inputs, I would set to 2.5 turns out.

    My guess is it will ride ok but will feel weak and a bit flat.

    I think I even have a set of 2 x 115's and 2 x 118's here you can have if I still have them.

  10. #9
    Biker Slipry's Avatar
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    sorry scratch that - i had 118 mains - sorry for misleading

    115's are the go to jets for the mods suggested and "work" for a wider range of applications




    Quote Originally Posted by schultzy View Post
    I stuck a battery up my arse.
    Yeah, that's a cool story...

  11. #10
    Bik
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    Well it's difficult to source jets here in greece so what if i install the 110 112 i already have ,2 turns out and an extra 0.5 washer? You think that would be enough? If not ,the set you may have would be very usefull for me (Exhaust is still on the way from japan so i have enough time for research)

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