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Info Yamaha FZR250R, 3LN1, 3LN3, 3LN5, 3LN6, 3LN7 raising the speed Ignition cutout

Discussion in 'Yamaha 250cc In-Line 4's' started by my67xr, Nov 25, 2018.

  1. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    To raise the speed limit ignition cut out on the FZR250R 1989 to 1994
    First remove gauge cluster,
    Next remove the 4 screws to remove the gauge surround,
    then remove the 2x screw's holding the speedo drive adapter, and 2x screw's holding the speedo into the housing

    20181125_200327.jpg

    20181125_211104.jpg

    hall.jpg



    The hall effect sensor provide's the ignition cut at 190km/h, there is a thin metal disc on the back of the speedo which at 190km/h passes through a hall effect sensor and cut's out the ignition or maybe limit's the rpm's at that speed.

    20181125_200659.jpg 20181125_200526.jpg



    The Hall Effect sensor is the 2x black cube's to the right, and the disc that cut's the ignition is marked from the top

    IMG_154313204119F.jpg


    IMG_1543132132078.jpg


    hall effect.jpg


    upload_2018-11-25_21-37-35.png



    The disc needs's to be cut from the left side to raise the cut out speed
    As the speedo increase's speed the disc moves around anticlockwise when viewed from the back
    So you just move the needle to the position where you want it to cut out at, say approx 220 km/h and mark the disc, then cut it back to there
    Once reassembled it should cut the ignition when it reach's that point.

    IMG_154313220416F.jpg
     

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    Last edited: Nov 25, 2018
  2. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    What wizardry is this?
     
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Just a 'How To' raise the speed limit 180km/h cutout

    So if you had the perfect condition's to be able to run your bike to it's theoretical top speed of 217.7 km/h (6th gear 18,500 rpm's) you could just cut the required amount off the left side of the disc so that it did not run through the sensor until that rpm
     
    Last edited: May 23, 2019
  4. beano

    beano Well-Known Member Premium Member

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    i have hit the speed limiter on a vfr400 back in the day so i know what it feels like, but didnt think the fzr's had them. mine only pulls maybe a couple of mm past the 190kph mark at approx 18k rpm, but i cant remember what sprockets im running, maybe going up a tooth at the front would get you there, something to peruse for the future perhaps!!
     
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  5. Amara

    Amara Member Premium Member

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    I want to do this to my bike, but I don't quite understand a couple things that you said to do. Can you please explain in a little more detail about what to do when cutting the disk.

    What needle am I moving here ?

    And what do you mean when you say "you could just cut the required amount off the left side of the disc so that it did not run through the sensor until that rpm" ?
     
  6. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Firstly, why do you want to do this mod?
    Is your bike in good enough mechanical condition to do more than 190Km/h? and where are you going to do those speeds on Australian roads?
     
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  7. Gert

    Gert Well-Known Member Premium Member

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    I did this mod on my VFR400, but on my CBR250, I could not get the speed into the limiter. Perhaps my wife, who is much smaller and lighter....

    On the other hand, you can solder the connections from the hall sensor to fool it.
    MC22 limiter:
    MClimclos.jpg
     
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  8. Gert

    Gert Well-Known Member Premium Member

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    NC30 limiter, same print:
    NC30lim.jpg
     
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  9. Amara

    Amara Member Premium Member

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    I just don't like having limiters on my bikes. They ruin the if fun. Also you're a good enough rider on a fun enough road, the only speed limit is as fast as you can go.
    2 roads that can hold at least 200 km/h in some parts : Bermagui Rd, and the road between Kalaru and Merimbula.
     
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  10. Amara

    Amara Member Premium Member

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    My bike'll be good enough for at least 210km/h by the time I'm finished experimenting with it. This mod will be a good start
     
  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    210km/h is 18000 rpm in 6th gear on a FZR
    And you mean race track's not road's i think ;)
     
  12. Amara

    Amara Member Premium Member

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    Whatever you want to call them ;)

    But seriously though. Is the needle that you are saying to move, the one that points at your speed when you are riding ?
     
  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    No, in the back of the speedo there is a disc, when the raised part of the disc rotate's enough to pass the sensor in the back of the speedo it cut's the power to the TCI
    So to increase the ignition cut out speed, you need to trim some of the raised section of the disc so it delay's the ignition cutout as the disc need's to turn further before it cut's out
    The disc turn's at the same rate as the speedo needle move's.

    So you can turn the disc by hand and the speedo needle will move,
    turn it so the needle move's to approx 220km/h and mark the disc at the sensor, then let the speedo return to 0 and you will see how much of the disc need's to be cut off
     
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  14. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    So what will happen if the speedo is eliminated entirely? ... as in a drag bike
     
  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Good question
     
  16. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    I would assume unplugging this would let us know .. ? :)

    dash 2.jpg
     
  17. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah should do, pity they aren't easy to access, i would try unplugging mine.
    I am changing the intake manifold's over for new ones today
     
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  18. Gert

    Gert Well-Known Member Premium Member

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    She fires up, but as soon as you are hitting some higher revs, the ignition is cutting two cilinders. I don't know the exact rpm levels. But, fyi: unridable.

    If you can use a solder iron, you can lot the two pins at the back of the print and make a "bridge", as seen on my picture. No need to cut the disk. Easely to undo again too.
     
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