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

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The first ever ATC90, named the US90 as 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.

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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

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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

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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

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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

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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.

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Introduction of new model ATC110, Not much changed since the previous ATC90 model. Engine gets upgrade to 105cc. Rear fender constructed from "non-repairable" plastic. New decal design, basically the same as last year with a slight performance upgrade.

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Second model ATC110, changes from previous model limited to new decal design. New engine number configuration starting with TB02E~, new model ID system, this model "A"

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New features for 81: Fuel tank changes shape , Introduction of the much welcome "CDI Ignition" headlight changes from round to rectangular. Electrical system switches from 6v to 12v.

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