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Thread: thoughts on this atc 70 top end rebuild kit

  1. #1
    Join Date
    Jan 2011
    Location
    Greene,Ia
    --
    688

    thoughts on this atc 70 top end rebuild kit

    ive been looking around for a top end rebuild kit, in case i would have to rebuild my atc 70 motor due to it not wanting to start, and it only having 120psi of compression

    ran across this top end kit.
    http://www.ebay.com/itm/CYLINDER-REB...f74b9c&vxp=mtr

    thought it looked good until i saw the cylinder mounting holes. are these holes correct, or is it seriously that screwed up. when looking at the picture of the bottom of the cylinder. you see the top left mounting hole looks like it was partially drilled, then adjusted and redrilled? bottom left hole looks like it was too close and ate into the sleeve area? it just doesnt look square to me, is this correct? i wouldnt know as i havent tore the top end off my bike yet. but to me it honestly looks like it was screwed up. i dont wanna spend that kind of coin, just to find out its a cobbled together kit
    Last edited by SteveCZ28; 03-16-2014 at 04:23 AM.
    2006 Yamaha Raptor 700
    2004 Kawasaki KFX700 V Force
    1985 Suzuki LT230GE(wifes toy)
    1985 Honda ATC 70
    1979 Honda ATC 70 (daughters toy)


  2. #2
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,013
    That appears to be correct. On another note I bought a cylinder/piston/gasket kit two years ago without the head out of New York for $69.00 to my door in Canada. Still works great today. I'll try to find some info on it. I had the link in the 70 section over at .org but..........
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  3. #3
    fastatc70 is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Aug 2012
    Location
    Northbrookfield, Ma
    --
    166
    At the bottom of the cylinder that partially drilled hole is for the oil passage way. If you look at the engin case you will see an oriface and the partially drilled hole will allow oil from the oriface and will transfer to the head bolt and run up the cylinder to the head, cam plate. That is also why you will see o rings, that is the oil return.
    Trikes:
    1985 ATC 70 mod to 184cc
    1984 ATC70 mod to 124cc
    1983 ATC 70 Xmas restoration

    Quads:
    1986 TRX 250R
    2002 TRX 400EX
    2- LT80 for the kids
    1986 LT 50

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