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Thread: Piston won't fit

  1. #1
    Join Date
    Feb 2011
    Location
    fingerlakesny
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    2,834

    Piston won't fit

    Got a 74 suzuki rv90 mini bike . bought new rings and both rings go into cylinder with just a little gap between ring ends...install them on piston with oil ring on bottom ring and I can't get it to compress enuff to allow piston sliding into jug. These are i.e. suzuki rings...any ideas. ?
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  2. #2
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,014
    Is it the compression or oil rings that won’t enter the bore? If it’s thre oil ring, have you got it properly connected? Oil rings typically have a hook, or clip that connects the two ends together. If they aren’t connected the ring diameter will be too large to fit into the bore.

    What’s “just a little gap”? You should check and measure the gaps of your compression rings before you put them on the piston and make sure the corners of the ends have no burrs.

  3. #3
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,757
    Make sure the compression rings are installed correctly also , some rings are tapered or notched so make sure their installed the right side up . A lot of the small cc Suzuki motors are like that .
    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

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  4. #4
    Join Date
    Feb 2011
    Location
    fingerlakesny
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    2,834
    I don't see any markings on the Rings and both Rings fit into the cylinder with no piston just fine piston fits in the cylinder without Rings just fine I can get the top ring into the cylinder but not the bottom ring which I believe is the oil ring..while on the piston.
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  5. #5
    Join Date
    Feb 2011
    Location
    fingerlakesny
    --
    2,834
    It's just not compressing enough. I would believe if the inner Oil ring was not in there it would probably work but I don't know if that would affect the oiling
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  6. #6
    Join Date
    Feb 2011
    Location
    fingerlakesny
    --
    2,834
    Ring end gap in cylinder is .015 and other 1 has .018 gap.
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  7. #7
    Join Date
    Feb 2011
    Location
    fingerlakesny
    --
    2,834
    Got it... what is the proper procedure for breaking in a 2 stroke
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  8. #8
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,757
    I tell customers to give it a half dozen heat cycles , start with 5 - 10 minutes max let it cool down completely , 15 minutes , another 15 minutes , each time letting it cool down completely .
    No running it wide open and no extensive idling .
    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

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

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