ATC70 4 SPEED BOX 1982 ON

[Alan CF]

DOSH WAITING... would like to find a 4 speed box,
list of numbers below to confirm you have the right box,


The ATC70 uses a 72cc OHC single with a 3 speed [73-81] or 4 speed [82-85] auto clutch transmission.

Hope this info helps you guys get to know your ATC70 a little better.

FRAME VIN NUMBERS

1973....ATC70-1000001 and up....Front fork is silver..Only offered in Daytona Orange..2 piece rear fender assembly..Flame decal on tank.
1974....ATC70-1100001 and up...Same as 1973 model mechanically......Only offered in LightScarlet Red....Rear exhaust shield with 4 holes.


The ATC70 was not produced from 1975 to the fall of 1977, when it was re-released as a 1978 model. It received many changes from the 1974 model.

1978.....ATC70-2000036 and up.....One piece rear fender....Light Scarlrt Red.....Rec Front number plate
1979.....ATC70-2100001 and up....Unchanged other than fuel tank decal
1980.....TB03-2000001 and up......Light Scarlet Red........Black number plate
1981.....JH3TB030*BC600001 and up........Fuel tank decal change.....New Passion Red Color
1982.....JH3TB030*CC700001 and up.......Receives 4 speed trasmission....Fuel tank decal change
1983.....JH3TB030*DC800006 and up......Fuel Tank decal change
1984.....JH3TB030*EC900001 and up......Fuel Tank Decal change....Seat receives a Non-pleated cover
1985.....JH3TB030*FK000001 and up......Fuel Tank decal change....Blue seat w/70 logo.....Automatic cam chain tensioner


ENGINE NUMBERS

1973.....ATC70E-1000001 and up
1974.....ATC70E-1100001 and up
NO 1975 THROUGH 1977 MODELS BUILT
1978.....ATC70E-2000007 and up
1979.....ATC70E-2100001 and up
1980.....TB03E-2000001 and up
1981.....TB03E-2600001 and up
1982.....TB03E-2700003 and up
1983.....TB03E-2800001 and up
1984.....TB03E-2900001 and up
1985.....TB03E-3000001 and up

[Alan CF]

found this one, just come on, he says its a 4 speed, but wont post...
anyone in kent to collect for me

http://www.ebay.co.uk/itm/320803108125? ... 500wt_1202

[richardcole3]

alan . what u upto ha ha

you building summut same as mine ? or meatier ?

like i said i reckon you need c90 bottom end , atc 4 speed box . and a z50r kick start spline ? and a 110 head and barrell and to open your cases up a little

however if youve got something else in mind all that wont help

good luck in your search ...

[richardcole3]

more info :

You can get Atc 4 speed box in cub 90 cases, and fit a chinky cast barrel 50mm, put in honda rings and piston and fit e22 head, just increase your service time, or use domed piston and matched head and standard barrel . Fit heavy duty clutch springs in standard semi clutch. job done .


Stock C90 barrel can be bored out to 50mm takeing it to 98cc.
ATC70/S65 and later Z50 and i think crf50 4 speed gearbox can be made to fit ok you just need the right kickstart for the ATC box.
you can also fit CT70 and SS50 4 speed boxes but the kickstart and first gear can go if fitted to bigger engines.

[Alan CF]

back up for sale no reason why it fell through, he still wont post it, his loss
dont you just love it when sh1t happens to some people

http://www.ebay.co.uk/itm/320808242725? ... 500wt_1202

[Alan CF]

anyway, this chap seems more helpfull

http://www.ebay.co.uk/itm/110788946607? ... 691wt_1185