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Thread: *** 1977 atc 90 custom bandito replica build ***

  1. #16
    1979atc's Avatar
    1979atc is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Jun 2015
    Location
    NW Ohio
    --
    210
    Quote Originally Posted by Joseph Farrow View Post
    Here is the inspiration for that Build.

    Attachment 227938
    Going to be a neat build, can't wait to see it done. What kind of tank you have on that bike?
    1979 Atc 110 helm and son
    1977 Atc 90
    1980 Atc 110
    1984 Atc 110
    1985 Atc 110
    1988 XR 200 bored 40 over,
    Atc 200x bottom end.

  2. #17
    Join Date
    Sep 2013
    Location
    Saskatchewan, Canada
    --
    598
    Wow- just beautiful.

  3. #18
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,118
    Okay figured I would finish up on this build.
    For the final part we have the MOTOR.

    It started out life as a stock 89cc 1977 ATC90 motor.
    It is now a 180cc Helm & Son Alcohol Motor. For anyone who has not experienced one of these motors your are in for a susprise. They are unbelieveably fast and full of tork.
    When you grab ahold of the pull start you better have it on the compression stroke and tell yourself it is going to start....if not you may lose some skin in the palm of your hand. lol

    To get to 180cc form 89cc you have to do some major mods.
    Start with a stroker crank. This motor has a Helm & Son 61mm Long Rod with 14mm pin. (90). The bore is 61.75mm using a 14:1 Forged Venolia Alcohol Piston. It runs inside a Helm & Son Star Burst Cylinder. With the Long Rod stroker you have to use a 6mm Aluminum spacer plate.

    Click image for larger version. 

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    Click image for larger version. 

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    Up top it has a Ported Head with lightend and polished valves. HD springs and titanium keepers with lightend rocker arms.
    Cam is a BAPP Streaker II. Intake is a PK with 24mm Mikuni Carb with Sudco Pumper Kit.

    Click image for larger version. 

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    To handle the extra HP the clutch has been modified. It has HD plates and spring as well as a Reinforcement Ring. If you raced these bikes back in the day you know you can blow a clutch at high RPM's. The Ring keeps this from happening.

    Click image for larger version. 

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    On the other side it has the Hi/Low gear box removed for a Quick Change Sprocket Assembly. This allows for easy counter sprocket removal.
    Notice the Extra Large BAPP Pull Start Handle.

    Click image for larger version. 

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    To relieve internal pressure it has several vents including a BAPP dip stick. To help add life to the motor a Haden Oil Cooler keeps the oil cool.

    Click image for larger version. 

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    To make it sound good and to keep with the Helm & Son theme Judson used a super rare Helm & Son Stinger Exhaust Pipe.

    Click image for larger version. 

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    Well this just about completes this build. Stay tuned for more to come. Other projects in the works.
    I'll leave you with one parting shot......

    Me sitting on the Bike. "Bandito Joe" (Notice Judson made me take my shoes off before I could set on it. lol)

    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 *

  4. #19
    Join Date
    Feb 2011
    Location
    San Marcos Ca.
    --
    607
    You guy's out did yourself on this build. Awesome trike, now lets get it in the sand turn & burn!!!!!!!!!!!!!!!!!!!!!!!!!!!
    * 1970 US90 Red
    * 1978 ATC 90/180 Helm&Son, Bandito /3D springer. ( Spaghetti Winder )
    * 1978 ATC 90/128 Bandito / Ace Williams Springer.
    * 1980 ATC 110/ ? Helm&Son, Dickson Full Suspended
    * 1981 ATC 110 MTC Full Supended
    * 1985 ATC 200s
    *1986 ATC 250R/310 2"+ Westcoast Swinger

    http://www.ebay.com/usr/jwheeler760

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