The last quarter before WOT
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Thread: The last quarter before WOT

  1. #1
    Junior Member LATW's Avatar
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    The last quarter before WOT

    my bike is running so good after a rejet and k&n filter.
    I've shimmed the needle with two washers from procycle and I have my fuel screw at 2 1/4, but I still get a very annoying hiccup at 3/4 WOT so cruising around.

    So using the google carb tuning chart.
    ATV Carburetor Jetting Instruction - ATV Technical Articles
    The main is to big or to small? its currently a 110 right now from procycle.

  2. #2
    Senior Member jbfla's Avatar
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    Quote Originally Posted by LATW View Post
    .....
    The main is to big or to small? its currently a 110 right now from procycle.
    This is a pre-2001 TW ?.....with the round slide carb?

    Thinking out loud.... Why a 110? The stock main jet for the slide carb is 114. Have you tried the 112 and 114, and 116? With what results?

    Just a guess, but I think the 110 is too small.

    Have you done the tuning procedure? Or did you take someone's word for what the settings should be?

    Did you purchase the ProCycle jet kit? If so, what jets are included?

    jb
    Last edited by jbfla; 05-15-2014 at 08:43 PM.
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  3. #3
    Junior Member LATW's Avatar
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    Cool

    Quote Originally Posted by jbfla View Post
    This is a pre-2001 TW ?.....with the round slide carb?

    Thinking out loud.... Why a 110? The stock main jet for the slide carb is 114. Have you tried the 112 and 114, and 116? With what results?

    Just a guess, but I think the 110 is too small.

    Have you done the tuning procedure? Or did you take someone's word for what the settings should be?

    Did you purchase the ProCycle jet kit? If so, what jets are included?

    jb
    Awesome a reply!

    IM a new owner so lets run down the specs: 1994 round slide, K&N filter replacement and all new carb o-rings with verified no vacuum leaks.
    The main jet is a 115 now- these are the jets provided by pro cycle which are not OEM. So I think these jet numbers do not match up to the Teikei numbers, I believe they are Mikuni jets, small round.

    The pilot circuit is perfect all off idol and mid range putt power is dialed in.
    The plug is currently gaped at .020 and is a golden brown (guessed at gap just wanted to get a close known baseline)
    The needle has two washers underneath it, have you noticed the round slide carbs have a little quarter spacer stock? its like a washer with a small tang on it for alignment. Im thinking thats a possible 2 1/2 washers.
    whats really throwing me off is the bikes plug is lookin good, but the last quarter of the throttle position and the rpm at the max speed is choppy.
    I guess I have never gotten it rich and backed off so I could try bigger jets and another new plug to watch. I just really want to know whats gonna be contributing to the "chop at the top" its not the needle right? its all main jet and.... anyways thanks for any help and any other ideas!

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  5. #4
    Senior Member jbfla's Avatar
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    Thanks for the details... important if anyone will be able to help you.

    After I posted, I recalled that ProCycle was not using Teikei jets. Since the numbers don't correspond with the Mikunis, ProCycle may be the one to assist you.

    A call to them, or a PM to Mr. Bracket (on this forum, their TW specialist) might solve your problem.

    Other thoughts.... the 3/4 throttle position is the transition point between the influence of the needle and shims, and the main jet...but since the influence of the needle/shims overlaps that of the main jet, either could be causing the problem.

    As I looked at the photo on the ProCycle website, the shims looked thicker than the .01" shims I use...but that may just be the photo.

    If no one can provide you with a definitive answer, you will need to do some "trial and error" yourself with the shims and jets.

    i tend to agree with you that the main jet is the problem. Trying one size larger or smaller should point you in the right direction.

    ...another thought...check the fuel level in the float bowl.

    Here is a chart that I prefer over the one posted on your link.

    it shows that the pilot jet/circuit continues to add fuel throughout the throttle range...which it does.

    ...and lots of overlap between the parts.



    jb
    Last edited by jbfla; 05-16-2014 at 03:00 AM.
    Leisure Time Larry likes this.
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  6. #5
    Junior Member LATW's Avatar
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    thanks for the pointers I'll probably shoot a pm over to the guru,
    take a shim out and get a setting on float bowl level. I'll be back thanks! Awesome.chart BTW

  7. #6
    Senior Member Leisure Time Larry's Avatar
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    Don't forget to give the https://tw200forum.com/forum/technica...rb-tuning.html sticky a good read and then follow the procedure to save yourself the guessing games. Clean>Main Jet>Needle>Screw
    - Leisure Time Larry -
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  8. #7
    Junior Member LATW's Avatar
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    sideways

    Quote Originally Posted by lrppcer View Post
    Don't forget to give the https://tw200forum.com/forum/technica...rb-tuning.html sticky a good read and then follow the procedure to save yourself the guessing games. Clean>Main Jet>Needle>Screw
    All of that is very helpfull and just as I suspected im off in left field blind with the procycle jets because the numbers mean absolutely nothing to this carburetor. Back to square one on bike bandit ordering xtparts and hoping they fit. another 50ish dollars FLUSHED!

  9. #8
    Senior Member Leisure Time Larry's Avatar
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    Hope that helps.
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  10. #9
    Junior Member LATW's Avatar
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    Quote Originally Posted by lrppcer View Post
    Hope that helps.
    If only there was a way to cross reference the Teiki jets against mikuni jets. Good thing there so cheap and available I can try super rich and super lean untill the bike runs right, just a shame I didn't figure it out earlier.

  11. #10
    Senior Member jbfla's Avatar
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    Quote Originally Posted by LATW View Post
    If only there was a way to cross reference the Teiki jets against mikuni jets. Good thing there so cheap and available I can try super rich and super lean untill the bike runs right, just a shame I didn't figure it out earlier.
    Did you contact ProCycle?

    It seems that if they are going to sell kits with non-factory jets, they should provide a cross reference for the comparable sizes.

    jb
    TWilight likes this.
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

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