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Thread: Front Brake Master Cylinder - 250R Trike vs Quad

  1. 02-07-2009, 12:50 PM #1
    thedeatons
    thedeatons is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Front Brake Master Cylinder - 250R Trike vs Quad

    Hey guys... Long time no post...

    I now own a 250R quad, and am looking to upgrade the front brake master cylinder.

    I assume the 250R trike/quad controls are the same, so I am turning here for a technical answer, the quad guys cannot give me one.

    Does anyone know what size the front brake master cylinder's piston size is?

    13mm?

    18mm?

    Thanks!! James
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  2. 02-07-2009, 01:40 PM #2
    atc500x
    atc500x is offline Got The Holeshot Arm chair racerJust too addicted
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    Check on the master cylinder,habitually the diameter is indicate in the casting.

    1986 ATC500X
    1985 ATC250SX
    1985 ATC200X
    1985 ATC250R
    1986 ATC250R
    1984 ATC250R
    1981 ATC70
    1984 ATC70
    1985 ATC70
    Custom built ATC70 / 250R laydwon swap
    1986 ATC250SX FATCAT
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  3. 02-07-2009, 11:04 PM #3
    thedeatons
    thedeatons is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    It does say 1/2 out in front.... I was hoping for a metric number... LOL

    That works out to a 12.7mm master cylinder...

    My plan is to order up a 13mm radial master cylinder from a late model sportbike. Freshen up the ccockpit a bit with a new style lever...
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  4. 02-08-2009, 03:00 AM #4
    atvmxr's Avatar
    atvmxr
    atvmxr is offline New to the board Arm chair racerNew to the board
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    i dont think the brakes get much better than a TRX250r... you should try the yamaha or suzuki fronts for a comparision... LOL

    maybe the TRX450r is better, but I cant think of anything else...
    My man Joe Dierte said it best... "I'm new, I dont know what to do!!"



    couple of 350x's, couple of blasters, couple of TRX 250r's, a zilla, and 92 hybrid LT250r / 87 LT500R motor...lets ride!!
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  5. 02-08-2009, 12:37 PM #5
    thedeatons
    thedeatons is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Yah I know, which is why I am trying to find a 12.7mm radial master, because then the ratio stays the same but you get the benefit of a radial master and the new style looks....

    Having trouble finding one that is cost effective...
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  6. 03-31-2009, 10:03 PM #6
    audioworks04's Avatar
    audioworks04
    audioworks04 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    should be able to pick up a used one off a street bike for not too bad off of ebay. thought about doing this on my trx250r awhile back, but couldnt fidgure out how to protect the rez from being trashed in the trails/rolls/flips. also most master made for street bikes at least will have way too much volume to be effecting on a trike meaning that they would tend to be very very touchy i would think. let us know if you find a way to do this effectivly.

    2005 CRF450R Alum Frame build done, switching to inverts.
    86 trx250r fmf fatty fmf q k&n v force reeds gold valve rear shock with eibach spring.
    86 atc250r stock sand only
    88 NX250 mint rainy day
    85 kawi js550 stand up basicly stock
    87 kawi js550 scary fast for a stand up
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