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Thread: removing the 180kmph restrictor on jap imports

  1. #1
    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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    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

    its no problem.

    It is only jap imports, however i dont know if it does it on a non jap honda too?

    And the wire colours may be different, if anyone knows they have a jap bike, let me know, and I can look at the wiring diagrams and change the info(if available).
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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.

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    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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    Default Re: removing the 180kmph restrictor on jap imports

    I really dont understand why you would need to go faster than 112mph anyway. Ive seen 165 on mine and thats just silly. nice info on the mod though,

    Steven
    93 900 Blk Slvr Red/ totaled... I got parts for sale.....

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

    mainly because you know the scenario you get going on a motorway, and someone in a sports car is right behind you, so you both gun it.
    Its fairly annoying to hit 112 and it stops accelerating.

    165 isn't 112 now is it?
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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by sgtskip View Post
    I really dont understand why you would need to go faster than 112mph anyway. Ive seen 165 on mine and thats just silly. nice info on the mod though,

    Steven
    Silly... silly how? It's 53 better than 112

    No, seriously, I cannot imagine someone agreeing to own & ride a blade restricted at 112... what's the point? it's a superbike.

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    RRzone Elder sgtskip's Avatar
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    Default Re: removing the 180kmph restrictor on jap imports

    Really.... 112mph limit, thats 3rd gear. I've gone fast on a long open stretch on the way to or from college, with a police officer friend of mine, so I dont go to jail if I did get clocked at 165+.... he has a 600 so I let him go and then pass him. Do the mod and ride it like it needs to be ridden.

    Steven
    93 900 Blk Slvr Red/ totaled... I got parts for sale.....

  16. #16
    gixerkiller
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    Default Re: removing the 180kmph restrictor on jap imports

    THIS MOD IS ONLY FOR BIKES IMPORTED FROM JAPAN

    ALL OTHERS DO NOT CONTAIN THIS LIMITER

    Japanese law prohibits large horsepower and high speeds.

    in fact, the new 1000rr,R1, ZX-10, and GSX-r bikes ARE NOT SOLD IN JAPAN UNLESS THEY ARE IMPORTED FROM THE EUROPEAN NATIONS AND THE MUST BE FITTED WITH RESTRICTIONS.

    ALL sportbikes are labeled FOR EXPORT SALE ONLY.

    ALL US,EURO,CANADA,ETC bikes have a different set of limiters, some are timing,others are emissions, and others are even both.

    does this clean up any confusion?
    Last edited by jawhn; August 13th, 2009 at 07:23 PM.

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    Default Re: removing the 180kmph restrictor on jap imports

    Great write up Gothy!! If my shit had a restrictor, I'd want it removed whether I rode that fast or not.
    "Crankenstein" is a GO...

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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by A30 View Post
    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
    I have read your posted thread regarding how to derestrict the igniter about speed which is veru helpful.

    as you have described at 2K ohm resistance mod at ignition module, I have Black/white wire there but there is no Brown/blue wire strip. there's some other wires colour which match with my manual wiring code. Please guide me what wire to cut instead of Brown/blue wire, becos i dont have there.

    My Bike start missing at 5000 RPM (Bogging) so that i want to get rid of it , so my bike could rivive up more.

    Please help me out how to resolve this problem.

    Many Thank

    Shahid

  19. #19
    gixerkiller
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    Default Re: removing the 180kmph restrictor on jap imports

    Quote Originally Posted by shahidmajeed View Post
    I have read your posted thread regarding how to derestrict the igniter about speed which is veru helpful.

    as you have described at 2K ohm resistance mod at ignition module, I have Black/white wire there but there is no Brown/blue wire strip. there's some other wires colour which match with my manual wiring code. Please guide me what wire to cut instead of Brown/blue wire, becos i dont have there.

    My Bike start missing at 5000 RPM (Bogging) so that i want to get rid of it , so my bike could rivive up more.

    Please help me out how to resolve this problem.

    Many Thank

    Shahid

    is your bike A JAPANESE IMPORT???

    if not you will need to figure out what wire does what.

    WIRE COLOR CODES ARE NOT THE SAME REGION TO REGION

    THIS MOD IS FOR JAPANESE IMPORTED BIKES ONLY!!!!!

    all others are different BE SURE YOU HAVE THE RIGHT BIKE BEFORE DOING THIS MOD PEOPLE

    WHO KNOWS WHAT COULD HAPPEN, BURNED CDI, BURNED COILS, BURNED STATOR? all are expensive so check your vin before you cut.

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

    Very good advice Dennis.

    The title thread is JAP IMPORTS.

    Its strange that normally a chafed wire causes them to go into "limp mode", so to be honest although fitting the resistor mod will stop the 5500rpm limiter, the wire will still be broken.
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