Throttle Response UNDER 4k RPM's
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Thread: Throttle Response UNDER 4k RPM's

  1. #1
    Evil Twin malenurse13's Avatar
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    Throttle Response UNDER 4k RPM's

    Over the next few weeks (or months) I'm going to attempt to systematically inspect and correct anything that would affect my TLR's performance UNDER 4k RPM's. The bike runs near perfect over 4k RPM's. Throttle response is smooth, quick, and predictable at all RPM's over 4k. Throttle response under 4k RPM's improved some when I put the right IAPS on the bike. Thanks again to Six5 for identifying the problem!
    However, it still feels like something is wrong. I'm assuming it's either electrical or fuel related. But I'm a nurse... not a mechanic.
    The purpose for this thread is I would like to compile a list of ALL factors that could effect throttle response and performance under 4k RPM's. I understand the bike has several things that change around ~3750 RPM's. I've put together a list of ideas from reviewing several other threads. But I'd like to have one list to go from and hopefully some recommendations on what order to go through this list while trying to correct the problem. So anything you can think of that would effect throttle response under 4k RPM's... please list it here. Thanks!

  2. #2
    AMA Pit Boss snowblind's Avatar
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    A common(ish) problem with TLs is a rough spot around the 3-4K rpm mark. This is usually down to overfueling. As mentioned elsewhere, ensure the vac system is up to spec and if the problem persists seek out someone with a Yosh box. They will be able to correct the fueling and it should fix the problem.

    Your local Dyno shop should be able to assist.
    Like my TL I'm old, overweight and badly maintained but I can still surprise you by how fast I can move.

  3. #3
    MotoGP Pit Boss The Ring-In's Avatar
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    I recently yoshed jappiemike's bike.
    I took 5% out of all the low mid and top ranges
    Added 4% to the idle to correct the transition from idle
    bike is smoother and does not fart on deceleration and picked up 4 Hp on the dyno
    And increase the mileage on a tank of gas


    cheers stu

    Naked TLS 97 , D port heads, TRE, Carrozzaria gold wheels, GSXR750 triples and forks, R1 calipers, Ti Force titanium exhaust system, welded clutch centre, ring-in CCC, polished pressure plate, 999 ducati radiator, custom handlebar fairing, polished ali screen, TLR clocks, Van reservoirs, TLR swingarm, TLR Ohlins rear shock, Norton Commando handlebars on 65mm risers, extra heavy polished billet brass bar-ends, custom shaped seat pad, billet levers and pegs, stainless brake lines, modified airbox, PC11 ,undertail, hugger, clear taillight lens, hidden LED number plate lights, Personal number plate (97TLS),SV coils, ring-in pushrod seal saver.

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  5. #4
    Evil Twin malenurse13's Avatar
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    Quote Originally Posted by snowblind View Post
    Your local Dyno shop should be able to assist.
    I know I should be asking the Dyno guys this... But would the Dyno shop need a Yosh Box as well? Or is Dyno-Tuning a different process?

  6. #5
    AMA Pit Boss snowblind's Avatar
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    A Yosh box is something a dyno shop is likely to have. Its not guaranteed but its a good place to start.
    Like my TL I'm old, overweight and badly maintained but I can still surprise you by how fast I can move.

  7. #6
    AMA Pit Boss snowblind's Avatar
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    Try this lot.

    http://motorcycle-repair-shops.cmac....o-madness/663/

    Its a bit of a hike from Vivian but probably worth a call.

    Been a long time since I was in that part of the world. I visited a place in Kenner/Metarie that did tuning work on Japanese bikes. Somewhere on I10 as I recall but that's about all I do remember.
    Like my TL I'm old, overweight and badly maintained but I can still surprise you by how fast I can move.

  8. #7
    Evil Twin malenurse13's Avatar
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    I found a shop that has a Yosh box. I'm gonna do the TPS & TB Sync first. But when I'm done... What is the difference between dyno tuning and using a Yosh box?? I have 2 shops to choose from. One says they dyno tune. One says they have a Yosh box.

  9. #8
    Evil Twin Jonstorp's Avatar
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    Quote Originally Posted by malenurse13 View Post
    I found a shop that has a Yosh box. I'm gonna do the TPS & TB Sync first. But when I'm done... What is the difference between dyno tuning and using a Yosh box?? I have 2 shops to choose from. One says they dyno tune. One says they have a Yosh box.
    you put the bike on a dyno, hook it up and run it, and get the data on what to adjust, and then you adjust it with the Yosh box....
    TL1000S -97
    Bitubo rear shock, custom undertail, highpipes, hugger, Barnett clutchsprings, Airbox mod, K&N airfilter, inline fuelfilter mod, thermostat mod, Ivans TRE, +mod, charging mod, headlight relay mod, Speedohealer, TLR Brake M/C, Nissin 4-pots front calipers with Goodridge lines.

  10. #9
    Evil Twin malenurse13's Avatar
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    Ok, so if I really want to get the bike tuned right... I need to choose the shop with the dyno. The other shop that only has a Yosh box might not know what adjustments to make... right? Or would a simple test drive give a mechanic all the info needed to make the right adjustments with a Yosh box??

  11. #10
    AMA Pit Boss snowblind's Avatar
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    Depends how clever the guy with the dyno is and what tools he's got available. He should have an EGA with the dyno but he'll need something to make the adjustments with. You do come across these spooks who can tune a motor by sense of smell almost. Trouble is they are few and far between. There's a lot more cowboys than brain surgeons. Talk to the dyno guy. Explain what you think you want and see what he comes back with.

    If you don't like the sound of it go to the guy with the yosh box. He may have a good idea of the changes needed. You've also got Ring-in's numbers in the earlier post which might be a good start if you have to "trial and error" it. I don't think he's working today but I can try calling the guy who did my tiller and see if I can get the numbers for the changes he made. Sorted the exact same problem beautifully.

    Update: Just spoke to him and he says that unfortunately TLs tend to be all different when it comes to setting up the fueling right. Do one and it wants +5% richer and the next one wants 5% leaner. Fraid he also couldn't remember what he did to mine to make it behave.

    He suggested you get the guy with the Yosh box to meet you at the guy with the dyno's shop and you bring the beers.
    Like my TL I'm old, overweight and badly maintained but I can still surprise you by how fast I can move.

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