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  1. #1
    Member dutchbat's Avatar
    Join Date
    Dec 2012
    Hey forum ,

    I have a problem that's very annoying. When i try to start my bike (electricaly) it doesn't work, the only way it will start is by push starting it and revving it a little before i can switch is back to neutral.. so after beeing pissed for a while it started looking up the symptomes on google and some other forums, where i discovered that the problem probably was that my main jet was to small (i changed my airfilter to a K&N filter btw). so when i was looking for my jet size in the manual i was stopt emediatly because i couldn't figure out what it was actually saying.. because a 118 jet seems a little small to start of with.. (even though i have a TW125 and not a 200...)

    the manual says:


    Type --Y24P

    I.D. mark --5EK1 00

    Main jet (M.J) --#118

    Main air jet (M.A.J) --ø1.4

    Jet needle (J.N) --4C78-3/5

    Needle jet (N.J) --T00

    Cut away (C.A) --2.5

    Pilot air jet (P.A.J) --ø1.3

    Pilot outlet (P.O) --0.8

    Pilot jet (P.J) --#38

    Bypass 1 (B.P.1) --1.0

    Pilot screw (P.S) --2

    Valve seat size (V.S) --ø2.0

    Starter jet 1 (G.S.1) --#60

    Starter jet 2 (G.S.2) --#60

    Float height (F.H)

    Fuel level (F.L) --0 2.0mm

  2. #2
    Senior Member frog13's Avatar
    Join Date
    Jun 2011
    SW, Ohio
    Tbot,what year is your bike?....what is your elevation in Holland?.If you believe your bike is running lean,i believe you'll want to go up in main jet size.

  3. #3
    Senior Member lizrdbrth's Avatar
    Join Date
    Jul 2010
    Desert, SoCal
    Your main jet has nothing to do with starting. Your pilot jet and choke contral that.

    Are you saying that your battery runs down before it starts or that it cranks but won't fire unless you push it?

    If it's the latter your problem is a slow starter not building up sufficient speed to fill the capacitor in the CDI, or weak ignition components.

    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  5. #4
    Senior Member LittleCowTW's Avatar
    Join Date
    Mar 2013
    Portland, OR
    +1, check this out. not TW specific but still very informative.

    I run pipe and pods as well and I do not need a bigger pilot jet FYI for my 96 dub. just 2 1/2 turns out on the pilot screw. your probably sitting at a half turn out from the factory and its leaning you out on startup.
    Persistence is the better part of genius.

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