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Thread: ATC90 cylinder compatability

  1. #1
    Join Date
    Apr 2006
    Location
    SE CA Dez in the sandbox
    --
    892

    ATC90 cylinder compatability

    Are there any other cylinders that can be used to replace a stock cylinder. Perhaps from a trail 90?

    Thanks for any help.
    Have '85 350X-XR500 Hybrid,
    Had Nicholson framed: 90/110, 185s, Gen I 500, Gen II 500
    Had Bandito Framed 90
    Have Vey's Framed 90
    Have too many parts

  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Depends on what year 90 you’re looking for ?
    The early us90 motors seat differently into the heads .
    The ct90 should be the same if it’s the same era , I believe 1975-78 are the same 74 and earlier are different .
    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

  3. #3
    Join Date
    Apr 2006
    Location
    SE CA Dez in the sandbox
    --
    892
    Thanks Mike, looks like it's a 1976. That opens up possibility. Looks like I might have a line on a"big bore" piston, and met with a buddy who suggested a CB750 sleeve and piston (LOL, they're probably pretty scarce).

    Trying to finish up a Joker roller I've been storing for a very long time.

    Thanks for the help.

    Rick
    Have '85 350X-XR500 Hybrid,
    Had Nicholson framed: 90/110, 185s, Gen I 500, Gen II 500
    Had Bandito Framed 90
    Have Vey's Framed 90
    Have too many parts

  4. #4
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,271
    Rick find a CB550 cylinder. Those are the sleeves you need. You can find them on ebay for $50 to the door all day long. Standard bore is 58mm and can go out to almost 62mm.
    The sleeves will press out with little effort. You will need to machine the outside and top lip but is a simple fix with a lathe. Way cheaper than paying LA Sleeve.
    * 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 *

  5. #5
    Join Date
    Jan 2009
    Location
    ohio
    --
    1,750
    Does the cb550 pistons have the same pin size as the 90/110 engines ?
    If its on the internet its got to be true they can't put any lie's on the internet

  6. #6
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,271
    The 90 uses a 14mm wrist pen. The 110 uses a 15mm pen. The CB550 and CB750's both have 15m pens. To use either piston you will have to modify the piston to work. The deck height is different and the skirt will have to be modified to use with a stroker.Click image for larger version. 

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    * 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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