Jetting Questions for a Stock Engine
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Thread: Jetting Questions for a Stock Engine

  1. #1
    Senior Member Welder's Avatar
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    Jetting Questions for a Stock Engine

    I have a couple of 2015s. They both seem to run identically. They are very cold blooded. They pop a lot on deceleration. Once warm, they seem to snatch and surge when cruising at small throttle openings. Revving up off idle while in neutral seems sluggish. At moderate to high throttle openings and loads the bikes run pretty good. Doesn't surprise me, the last few carbureted bikes I bought new behaved the same.

    Anyhow here are my questions:

    Where is the idle air screw on this carb?

    If it is under a cap, what is the best way to access the screw without screwing anything up?

    Do we know what pilot jet came in these? If not, would the dealer be able to look this up and order a bigger one?

    Do we have any members who have been down this exact path already that could provide any helpful wisdom?

    Thanks
    Czechsix likes this.

  2. #2
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Welder View Post
    ?..

    Do we have any members who have been down this exact path already that could provide any helpful wisdom?

    Thanks
    Nearly everyone.

    You can start by reading some of the Tech Write Ups

    https://tw200forum.com/forum/technical-write-ups/

    2 1/2 turns out is the usual starting setting for the pilot screw, but you will need to fine tune it from there.

    Jetting depends on your elevation.



    jb
    Last edited by jbfla; 07-04-2015 at 11:05 AM.
    2018 Triumph Street Twin..............2016 CB500F
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  3. #3
    Senior Member Russandkava's Avatar
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    There a re a lot of posts about jetting on here. Pro cycle sells a jet kit that worked great on mine. A 2005.

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  5. #4
    Senior Member grewen's Avatar
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    same with mine
    Greg

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  6. #5
    Senior Member Welder's Avatar
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    I have read the write ups, thanks. I live and ride at about sea level, with most average temps around 65F, freezing to about 95 are the extremes and I don't intend to rejet for weather changes.

    With a stock engine is an air screw adjustment normally enough to get things straightened out or is a bigger pilot jet and/or needle shim needed too?

    I ask as I see no sense monkeying with air screw alone first if it is know for sure that the carb is going to need to come out for a pilot jet change as well and then the air screw readjusted after.

  7. #6
    Banned ZDR1's Avatar
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    I think the reason most rejet is a FMF or DG muffler yours is still stock?

  8. #7
    Senior Member Welder's Avatar
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    Totally stock and will stay that way, other than the jetting.

  9. #8
    Banned ZDR1's Avatar
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    All you need to do is remove the plug and adjust the idle mixture screw (2 to 2 1/2) and keep your air filter clean. I cut down and grinded a screw driver to adjust.
    Welder likes this.

  10. #9
    Banned ZDR1's Avatar
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    And 2015 you are doing the break in.

  11. #10
    Banned ZDR1's Avatar
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    I put the Procycle kit in a few weeks before we did the 2014 Moab trip and I could not dial it in so I put it back the stock and did fine.

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