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Thread: how do i tell what size piston I got in my R

  1. #1
    Join Date
    May 2010
    Location
    Ripon, Wisconsin, United States
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    861

    how do i tell what size piston I got in my R

    Pulled the top end off my 86 R and the piston looks cast and says IN on the reed side and on the side it says ART. The head gasket looked like a moose one I have and the base gasket was royal blue and white. Does that stuff sound original?
    ]1986 ATC 330R
    1985 ATC 250R vintage PSI racing ported motor
    Get your replacement ATC 250R decals and custom Big Bore #'s here http://shop.3wheelerworld.com/catego...=2&pagegroup=1

  2. #2
    Join Date
    Mar 2010
    Location
    plymouth,il
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    1,231
    Use a digital caliper if ya got one. If you don't take it to any machine shop and ask them to measure it for you. if won't take but about five seconds and they probably wil do it for free, the ones around here will anyway.
    Life is better on 3 wheels
    1984 200es big red
    1976 suzuki rm125
    1983 honda 250r (minty fresh) SOLD
    1986 honda 350x (A PILE....for now)
    197? honda 90 (pauter framed little beast in the making)

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