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ATC70 1973 (K0)
The very first ATC70, identified as a
1973 model but probably produced from mid 72 onward.
Distinguishing Features:
Orange body colour, Silver coloured forks, 5 hole
rear cover plate, Flame design tank decal, angled
exhaust silencer, 2 rib foot guards. 7 digit engine
number, first two digits 10, ie ATC70E
1000001~ |
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ATC70 1974 (K1)
2nd model of the series, production commenced in late
1973 and continued throughout 1974. Remaining models
sold through 75. Similar in design to its predecessor.
Distinguishing Features:
Red body colour, Red forks, 4 hole rear cover, straight
exhaust silencer, 3 rib foot guards. 7 digit engine
number, first two digits 11, ie ATC70E-1100001~ |
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ATC70 1978 (K3)
After a long absence the ATC70 returns, why did they
stop production of this hot seller for 4 years, who
knows. The new design is similar to the ATC90 with one
piece rear fender/seat assy, non-laminated steel frame,
exhaust system relocated to outside of frame. Outboard
brakes meant easier brake servicing. A new improved
chain tensioner did away with a splined shaft that was
prone to stripping. All in all a nice package with some
good improvements.
Engine number ATC70E-2000007~2010823 |
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ATC70 1979 (Z)
Second model of the new generation.
Very few changes from previous model, slight engine
and frame revisions, rocker arm clutch components, transmission
parts, brake cam, starter handle. Visible changes restricted
to decals. K~ model identification dispensed with (Note:
code for this model "Z".)
Engine number ATC70E-21000001~ |
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ATC70 1980 (A)
New Model identification
begins, if you can count to ten you can figure it out
0=A, 1=B, 2=C and so on. Little or no change from the
previous model apart from decal differences and revised
camshaft and cam chain tensioner. New engine number
sequence derived from Trail Bike models.
Engine number TB03E-2000001~2011736 |
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ATC70 1981 (B)
1981 models changed very
little from previous years, basically a decal change
to differentiate from earlier models. Paint changes
from Light Scarlet to Passion Red although to look at
it appears the same colour. Gearshift drum revision,
basically the same bike as before.
Engine Number TB03E-2600001~2611751 |
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ATC70 1982 (C)
1982 models saw the introduction
of a 4-speed transmission a welcome revision as the
three speed tranny left a lot to be desired. Generally
but not always a 4-speed engine could be identified
as having 8mm case screws as opposed to previous "Phillips
head " screws.
Engine Number TB03E-2700003~2718283 |
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ATC70 1983 (D)
Some changes since previous model, cylinder
head revision, countershaft, low and second gear revision,
throttle cable securing band and guide added, handle
bar revision, handle bar mounts get plastic cover, fuel
tank revision, exhaust system revision
Engine Number TB03E-2800001~2827785 |
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ATC70 1984 (E)
Very little difference from previous
model. Hand brake lever revision, exhaust heat shield
changes. Tank decal is same design only colours are dark
blue and light blue. Seat loses its "Quilted"
design in favour of plain vinyl. Engine
Number TB03E-2900001~
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ATC70 1985 (F)
85 sees end of production for the ATC70
to make way for its 4-wheeled cousin the TRX70. Minor
changes limited to decal changes and seat gets new blue
colouring. "70" stenciled on seat. revision
to cam chain tensioner.
Eng Number TB03E-3000001~ |
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ATC90 (US90) 1970-71 (K0)
The first ever ATC90,
named the US90 as identified by the engine number
prefix of US90. Produced from late 1969 through
1971. Distinguishing features: No headlight or
tail-light, Honda name on tank in badge form instead
of decal, plastic thumb throttle (prone to breakage
and replaced under warranty with alloy unit)
7 digit engine number US90E-100122~ |
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ATC90 (US90) 1973 (K1)
Second model ATC90, some changes from
first model, Headlight & Tail-light become standard
instead of optional. Seat cover appears to be different,
Tank loses badge in favour of stick on decal. Otherwise
basically unchanged.
Engine number US90E-2000001~ |
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ATC90 1974
(K2)
Third model ATC90. US90 engine number
now gone in favour of ATC90 prefix. Fold away foot rests
replaced with fixed units. Fold away head stock dropped.
Front fender changed from metal to plastic, rear fender
re-styled. Body colour "Orange" borrowed from
K0 ATC70
Engine number ATC90-1300001~ |
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ATC90 1975
(K3)
Introduction of the new "Knobby
Tyre" model. Available in any colour so long as
it was red. Slight frame revisions and inclusion of
plastic mud flaps front & rear. Heavier that previous
model due to wheel design and accordingly lower power
to weight ratio
Engine Number ATC90E-1400001~ |
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ATC90 1976
(K4)
Second of new generation design, very
few changes from previous model. Basically the same
bike except for decal differences. Honda did a good
design job with the previous model and consequently
there were no revisions required
Engine Number ATC90E-1500001~
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ATC90 1977
(K5)
1977 proved to be as unexciting
as the previous model in as far as new features were
concerned. Very little change from the last model apart
from the standard decal changes to make it look different.
One interesting point was that a "Chevron"
style tyre was offered as an option for this model.
This tyre is similar in design to the ones fitted to
K0~K2 models only it suits the later split rim
Engine Number ATC90E-1600001~ |
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ATC90 1978
(K6)
1978 sees the end of production for
the ATC90, few changes limited to the tank decals and
rear fender decals. Rear carrier rack gets beefed up.
Engine Number ATC90E-1700001~
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