//ArrowChat Code
Page 3 of 3 FirstFirst 1 2 3
Results 31 to 37 of 37

Thread: atc70 build thread

  1. #31
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Wouldn’t hurt to use some valve lapping past to reset the flywheel on the crankshaft. Just put a generous amount on both the shaft and flywheel keyway areas , rotate back and forth until the surfaces look mated .
    A good snug / mated fit is very important or it will sheer again .
    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

  2. #32
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    1,144
    Quote Originally Posted by shortline10 View Post
    Wouldn’t hurt to use some valve lapping past to reset the flywheel on the crankshaft. Just put a generous amount on both the shaft and flywheel keyway areas , rotate back and forth until the surfaces look mated .
    A good snug / mated fit is very important or it will sheer again .
    That's a nice little trick Shortline, never considered that
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  3. #33
    Join Date
    Mar 2018
    Location
    Halifax, NS
    --
    34
    Good trick! I will use some gearing blue to see the high spots and file them down first, then I’ll definitely do the valve lapping compound trick. Thanks!

  4. #34
    Join Date
    Mar 2018
    Location
    Halifax, NS
    --
    34
    So I also received my replacement crankshaft. Supposedly for a atc70 but as you see in the picture it’s much bigger. Of course ebay seller says it’s the right one and I’m wrong and wants me to ship it back and cover shipping both ways (which is twice the price of the sale). It looks like a 110cc crank...



  5. #35
    Join Date
    Mar 2018
    Location
    Halifax, NS
    --
    34
    Morning! It’s been a while. I had the bike running by welding the end of the crankshaft and making a new key.

    That wasn’t too great as the timing wasn’t quite right. Also the bike was smoking quite a bit so I found a used crankshaft and flywheel (other flywheel was wobbly on the shaft) and I started the teardown.

  6. #36
    Join Date
    Mar 2018
    Location
    Halifax, NS
    --
    34
    So I have a few questions (of course):
    -cylinder seems fine. We can still see the marks from the cross honing. Do I need to do anything with it you think?
    -rings look good. Is it better to replace them or leave them alone?
    -see that piston? Slight rubbing on the skirt but it looks ok. I suppose it was oversized 0.75 at some point from the stamping?
    -my camshaft has some wear. There are some original used ones on ebay and a NOS but the NOS is for 78 to 80... per the part number but the seller lists for up to 1986 (and the aftermarket equivalent is the same from 78 to 86... but the original has a part number difference) big differences you have seen? Anybody else has swapped them?

    Thanks!!
    David

  7. #37
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,001
    Another option for the top end is to buy a complete Chinese kit from eBay. I got a complete cylinder, piston/rings, wrist pin and gaskets to my door (Canada) for less than $100.00 a few years ago for my 1973 70. I know some would shudder about OEM but it fit great and runs perfect to this day.
    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
    1977 ATC 90 w/83 110 motor (Fugly)
    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
    1978 Honda XL75

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

//ArrowChat Integreation Code //