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Thread: Help. What side is the IN on for my new piston from Dratv for the ATC 70

  1. #1
    MN250R's Avatar
    MN250R is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Help. What side is the IN on for my new piston from Dratv for the ATC 70

    Got my new 88cc kit for my atc 70 from dratv. Got the rings all lined up but there is no IN on the piston. I see a side that looks a little grinded on top. Wonder if thats it?


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    1986 ATC 350X
    1986 ATC Big Red 250ES

  2. #2
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    The biggest valve is the intake. So,the biggest fly cut goes intake side.
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    MN250R's Avatar
    MN250R is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    ok, the side that looks like more metal is cut out is the side that has the grind marks on top
    1986 ATC 350X
    1986 ATC Big Red 250ES

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    The dimple will go on the right side when sitting on the bike...

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    MN250R's Avatar
    MN250R is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    awsome thanks guys!

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