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Thread: 85 250r finally got the bad trailprotrailprotrailprotrailprotrailpro done.

  1. #1
    Join Date
    Jan 2019
    Location
    US
    --
    12

    85 250r finally got the bad trailprotrailprotrailprotrailprotrailpro done.

    85 250r or the 282r lol.. bored 30.5 over gone through top and bottom end from frame up ...been 20 years since my last r,and it was a 86 and 85 200x

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  2. #2
    Join Date
    Jul 2005
    Location
    Manheim, PA
    --
    5,742
    30.5 over makes no sense nor does it = 282 if stock size is 66mm and nor your at 96.5mm

    a 310R is 72mm piston

    if anything your maybe 3.5mm over the stock size because a factory sleeve wouldnt allow for much more.

  3. #3
    Join Date
    Feb 2019
    Location
    Western NY
    --
    50
    Perhaps he meant .035" over? That would put him at a 66.889mm bore.
    1987 Honda 250SX
    1987 Honda 200X

  4. #4
    Join Date
    Jan 2019
    Location
    US
    --
    12
    I'm at a 69.5 bore max u go ...it's running pretty good but it kinda kinda citing out or sputtering lit bit till u get in higher gears ..gas line come off carb other day while zipping around and carb ran out of fuel it quit cutting out and was running like it should..why would it do that?

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  5. #5
    Join Date
    Mar 2010
    Location
    Slidell, LA
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    4,737
    Quote Originally Posted by slippery View Post
    I'm at a 69.5 bore max u go ...it's running pretty good but it kinda kinda citing out or sputtering lit bit till u get in higher gears ..gas line come off carb other day while zipping around and carb ran out of fuel it quit cutting out and was running like it should..why would it do that?

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  6. #6
    Join Date
    Jul 2005
    Location
    Manheim, PA
    --
    5,742
    your no ware close to a 282cc. Can't figure it, please take it to a local shop where they will be experienced in properly looking at it

  7. #7
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    69.5 bore x 72 stroke = 273.1 cc


    The equation is done this way if others are interested .

    6.95 x 6.95 x 7.2 x .7854 = 271.1
    Bore x bore x stroke x .7854 = cc

    This works on any motor to measure displacement
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

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  8. #8
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,271
    Exactly! Thanks Mike

    Quote Originally Posted by shortline10 View Post
    69.5 bore x 72 stroke = 273.1 cc


    The equation is done this way if others are interested .

    6.95 x 6.95 x 7.2 x .7854 = 271.1
    Bore x bore x stroke x .7854 = cc

    This works on any motor to measure displacement
    * 1978 ATC 90/180 Pauter PJ1 / Springer "Team BAPP" Bike *

    * 1980 ATC 110/180 "Danny's Machine Works" 3D Sprint Dune Bike *

    * Nicholson 500 Race Bike *

    * HPATC Yamaha RD350 "Big Moe" Trike *

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