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    Moderator gothy's Avatar
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    Default removing the 180kmph restrictor on jap imports

    Hey guy's,
    This probably wont apply to anyone on here (it might 1% chance).
    At least it might get seen here (unlike on my forum)

    How to Remove the 180 kmph speed restrictor on japanese import bikes.


    Because Japanese bike laws are very different from our own, they have a top speed restiction at 180kmph or 112MPH.
    This is quite easy to bypass.

    Basically their is a disk inside the speedometer that rotates with the speedo needle, so when it hits 180kmh it alters the ignition timing on 2 cylinders, so it cannot go faster than 180.

    There are several ways to remove it, just choose which you prefer.

    1. The easiest but most expensive way is to fit a MPH converter, around 30, from a local bike shop, M&P direct, or Demon Tweeks.

    2. Fit a resistor in the circuit, this I will explain in the next post (2 ways). around 1 - 2 in parts.

    3. Remove the disk inside the speedo, or bend the metal tab/electrical connector. ( if you can get inside, its quite difficult!) FREE.

    4. buy for 40+ a box that fits in at the CDI end of the loom, with a resistor inside, from a shop, but their is no point as you can do it yourself for cheaper, using meathod no2.

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  2. #2
    Moderator gothy's Avatar
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    Default Re: removing the 180kmph restrictor on jap imports

    Disc inside the speedo. 1st pic

    HOW IT WORKS;
    1. Basically the first way fools the speedo into thinking your doing km when your doing mph, and since not many bikes are going to go faster than 180mph the converter is a good option for derestricting it.

    2. This fools the circuit into thinking the disk hasn't spun to 180 and completed the circuit in the speedo.

    3. Without the disk it cannot complete the circuit, thus the bike thinks its traveling slower than 180kmh.

    IS YOUR BIKE RESTRICTED?
    Its easy to find out how.
    In other bikes or a faired version its the dash fuse.
    Just remove the fuse for (its 1 fuse mine is a 10Amp);
    "meter, tail light, horn, turn, stop light, neutral light, hazard".

    Then ride the bike, carefully!
    remembering you have no indicators, no rear lights, no neutral light, no horn.

    It should misfire at 5500 RPM, and believe me its noticeable.
    If it doesn't misfire your bike has been derestricted already.

    fusebox, its the missing fuse. pic 2
    Last edited by gothy; January 9th, 2009 at 10:02 AM.
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    Moderator gothy's Avatar
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    Default Re: removing the 180kmph restrictor on jap imports

    Inside the rear of the speedo, their is a block connector on the rear.
    (this applies even if mechanically driven), but will be slightly different for every model.
    PIC 1

    You basically unplug this and fit a resistor mod. which is as follows.

    PARTS.
    Small female spade connectors,
    some wire,
    some heat shrink,
    and a 2k OHM resistor.

    PIC 2 is the mod.

    It connects to the two side connectors in the plug,
    you dont connect the green middle wire,
    just connect the orange with blue trace to one end.
    and connect the black with brown trace to the other end.

    here's what it should look like now.
    PIC 3

    There is another way of doing it, that saves the fuse from blowing causing the low rev misfire, (it wont go for a long time though).
    You have to fit the resistor mod at the CDI end.
    Last edited by gothy; January 9th, 2009 at 10:08 AM.
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    Moderator gothy's Avatar
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    Default Re: removing the 180kmph restrictor on jap imports

    CDI end resistor mod. PIC 1

    at the CDI or ECU , you need too source two wires. First the BROWN/BLUE STRIPED wire cut it.
    Then a BLACK/WHITE wire you need too remove a small amount of the plastic insulation.
    Then solder the 2k ohm resistor, from the bared BLACK/WHITE wire too the BROWN/BLUE STRIPED wire at the CDI END. then away you go

    (this mod wont blow the fuse as its on the other side of the wiring)
    Last edited by gothy; January 9th, 2009 at 10:23 AM. Reason: attachment
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    Default Re: removing the 180kmph restrictor on jap imports

    The easiest solution by far...

    KMPH to MPH converter 30
    PIC1

    The final option (not worth doing) is to look on the net for the little black blox that plugs into the CDI around $100, and does the same as the resistor mod about $4
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    Default Re: removing the 180kmph restrictor on jap imports

    Thanks for posting the "how to tell if your bike even has a restrictor" part. Because I have no idea. Although, I have had my bike up to '160' per the speedo, so that's way the hell above 112, so I guess I'm good. But I was starting to wonder if I did, and that's a cool way to find out.

    And thanks for the write-up as well.
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    Default Re: removing the 180kmph restrictor on jap imports

    very helpful

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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by gothy View Post
    CDI end resistor mod. PIC 1

    at the CDI or ECU , you need too source two wires. First the BROWN/BLUE STRIPED wire cut it.
    Then a BLACK/WHITE wire you need too remove a small amount of the plastic insulation.
    Then solder the 2k ohm resistor, from the bared BLACK/WHITE wire too the BROWN/BLUE STRIPED wire at the CDI END. then away you go

    (this mod wont blow the fuse as its on the other side of the wiring)
    After doing the mod this way my temperature gauge and fan stopped working. How did I manage that?

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    Default Re: removing the 180kmph restrictor on jap imports

    can this be done on 2005 CBR1000RR??... jap import

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    Default Re: removing the 180kmph restrictor on jap imports

    good

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    Default Re: removing the 180kmph restrictor on jap imports

    awesome post... you are a saviour!!

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    Default Re: removing the 180kmph restrictor on jap imports

    great

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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by gothy View Post
    Disc inside the speedo. 1st pic

    HOW IT WORKS;
    1. Basically the first way fools the speedo into thinking your doing km when your doing mph, and since not many bikes are going to go faster than 180mph the converter is a good option for derestricting it.

    2. This fools the circuit into thinking the disk hasn't spun to 180 and completed the circuit in the speedo.

    3. Without the disk it cannot complete the circuit, thus the bike thinks its traveling slower than 180kmh.

    IS YOUR BIKE RESTRICTED?
    Its easy to find out how.
    In other bikes or a faired version its the dash fuse.
    Just remove the fuse for (its 1 fuse mine is a 10Amp);
    "meter, tail light, horn, turn, stop light, neutral light, hazard".

    Then ride the bike, carefully!
    remembering you have no indicators, no rear lights, no neutral light, no horn.

    It should misfire at 5500 RPM, and believe me its noticeable.
    If it doesn't misfire your bike has been derestricted already.

    fusebox, its the missing fuse. pic 2

    i just joined this forum, i have a jap bike that has the limiter, but im blocked from viewing the images here.what to do now?

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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by ariamacha View Post
    i just joined this forum, i have a jap bike that has the limiter, but im blocked from viewing the images here.what to do now?

    Me too!

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    Default Re: removing the 180kmph restrictor on jap imports

    Even i need help with my 1998 VFR 800 Fi which is japanese locked.

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    Default Re: removing the 180kmph restrictor on jap imports

    if the disc is removed... will it have any undesired consequences ??

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    Default Re: removing the 180kmph restrictor on jap imports

    I had the 5000rpm miss fire on my cb400sf and read the post, and decided the easiest cure for me to do was dismantle the speedo and take out the restrictor.
    Once apart the parts inside were not the same as in your pics, there's a disc about 5mm thick and 20mm diameter behind the speedo face, this turns with the needle shaft.
    On one side is the pick up sensor, unscrew it and tape it up then tuck it out of the way. The parts in my speedo already have a resister fitted, if you unplug the whole thing you wont cure the problem.

    Pic- left, pick up sensor. Bottom, resister and holder, Top, plug.
    Sorry about the out of focus pic.
    Hope this will be of help.

    Leon

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    Default Re: removing the 180kmph restrictor on jap imports

    did you take that entire thing out of the meter because my bike has a same thing after i removed it the bike started misfire at 5000 there is a resistance fitted in the holder or do i need to removeall of this and do the resisitance modification or keep it there because before i removed it the bike was not misfiring.

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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by solutions View Post
    did you take that entire thing out of the meter because my bike has a same thing after i removed it the bike started misfire at 5000 there is a resistance fitted in the holder or do i need to removeall of this and do the resisitance modification or keep it there because before i removed it the bike was not misfiring.
    Like I said dont unplug it and remove it, just unscrew the pickup sensor [part on left in pic] and tape it up then tuck it out of the way.
    Mines outside the speedo under the chrome cover.

  20. #20
    Moderator gothy's Avatar
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    Default Re: removing the 180kmph restrictor on jap imports

    yes if you actually read mine,
    you will see that it says; simply unplugging it wont work.
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