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Thread: Stupid Piston Question

  1. #1
    Join Date
    Jan 2010
    Location
    Sapulpa, OK
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    13

    Stupid Piston Question

    Ok, I have a really stupid question. It's been several years since I rebuilt a engine. which way does the arrow on the piston face
    exhaust port or the intake?

  2. #2
    Join Date
    Aug 2008
    Location
    OK
    --
    5,450
    On my Tecate it faces towards the exhaust or forwards
    Rides:
    1986 ATC250R (sectional pipe and Klemm Research silencer)
    1986 ATC250R (Desert Bike, WAX-ON seat, Dual Cibie lights, Steering Stabilizer)
    1979 ATC110 (Bandito frame and forks, Turbo wheels, disc braked)
    1982 ATC70 (Lifan manual 125)
    1987 LT80 (piped, widened)


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  3. #3
    Join Date
    Jul 2009
    Location
    South Florida
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    6,786
    Yes the arrow toward the exhaust also the larger valve relief on the piston is always the intake side .
    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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  4. #4
    Join Date
    Nov 2008
    Location
    Coon Rapids, MN
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    956
    Towards the exhaust.
    1982 Yamaha YT125 tri-moto - Boyesen power reeds, YT175 front suspension, Headlight guard.
    1982 Yamaha YT175 tri-moto - Running but ugly
    1984 Yamaha YT 60 tri-zinger - Boyesen power reeds



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  5. #5
    eyecekold1's Avatar
    eyecekold1 is offline Check my feedback before buying from me First time rider
    Join Date
    Oct 2009
    Location
    Provo Utah
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    209
    I wish I would have asked this question last year, I went through 3 pistons putting them in the wrong way, I have since asked when in doubt.
    85 350x 12:1 piston and porting by "boosted96cobra"
    4 85 tecates 1 runs
    5 84 tecates none run
    1 84 Yamaha Zinger, mildly ported & polished, milled, bored .25 over finally running
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