Honda CT90 - Model History
The 50 year history of the venerable CT90 family
The Small Workshop
technology, shed building, motorcycles and hand tools
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Honda CT90 - cam chain tensioner
all about the CT90 cam chain tensioner
Honda CT90 - ignition
an overview of how the CT90 ignition system works
CT90 frame and rear suspension
All about the frame and rear suspension
Honda CT90 - lighting
all about CT90 lighting
Honda CT90 - wheels, brakes and cables
all you ever wanted to know about the CT90's wheels, brakes and so on.
Honda CT90 K1 - seat refurbishment
Honda still sell the seats for the later model CT90, but the version of the seat used on the 1969 K1 was only fitted for a couple of years
Honda CT90 - regulator/rectifier upgrade
Like many small bikes of this era, CT90s were not fitted with a regulator to control the amount of charge going to the battery...
Honda CT90 - steering head bearings
The steering head uses loose ball bearings - if you are replacing them you have an option to use tapered roller bearings instead ...
Honda CT90 Engine
The CT90 engine is very similar to the engine fitted to the Honda C90s from the 60s and 70s. There are a few changes of note though, and these are described below
Honda CT90 K1 - crank and crankcases
The early engines used in Honda's small 90cc bikes - including the CT90, C90, and S90 - had a design flaw that could cause serious engine damage...
Honda CT90 - retrofitting turn signals
Turn signals became a standard fixture on the CT90s in late 1973 following the introduction of federal legislation in the USA that made them mandatory on all cars and motorcycles. Retrofitting them to older bikes is straightforward
Honda CT90 K1 speedometer
The speedo used on the 1969 Ct90 k1 speedometer is a one-year-only version with a distinctive triangular shape. My bike was fitted with a later version - the different speedos used on the CT90 range are shown below. left: pre-1969 version / centre: K1 1969 / right: later version (note
Honda CT90 K1 Recommissioning
The first instalment of a short account on the work I did to repair the 1969 Honda CT90 K1 above. The jobs required were largely repairs and recommissioning
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