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Honda CT90 - Model History

Honda CT90 - Model History

The 50 year history of the venerable CT90 family...

The 50 year history of the venerable CT90 family...

Nick

01-Jan-2026 Honda CT90

Featured

JIS screwdrivers, screws and fasteners from Japan

If you've ever worked on a vintage Japanese motorcycle you've almost certainly struggled with countless buggered-up cross head screws. The usual recommendation to avoid further screw mangling is to put aside your old Phillips screwdrivers and get some "JIS" ones instead. There is a lot of confusion about this...

If you've ever worked on a vintage Japanese motorcycle you've almost certainly struggled with countless buggered-up cross head screws. The usual...

Nick

01-Oct-2022 fixings

Amazon Lightsail snapshots

Hosting your own web site comes with a number headaches, not least sorting out backups so you can recover your data should disaster strike. A relatively painless solution for those of us with servers deployed on a cloud platform is to use snapshots. To be honest it is a lot easier to use a third...

Hosting your own web site comes with a number headaches, not least sorting out backups so you can recover your data should disaster strike. A...

Nick

17-Dec-2021 website hosting

Honda Super Cub - history and manuals

The history of the Super Cub, including workshop manuals for the c50, C65 and C90 models from the late 50s to the early 2000s....

The history of the Super Cub, including workshop manuals for the c50, C65 and C90 models from the late 50s to the early 2000s....

Nick

14-Aug-2021 manuals

Washita Oilstones

Washita oilstones are used by woodworkers around the world and they all come from a small area east of Hot Springs in Arkansas, USA. Origins Washita, and the closely related Arkansas stone, are both forms of a rock geologists call Novaculite. As this research shows, Novaculite was used by Indians to make tools long before...

Washita oilstones are used by woodworkers around the world and they all come from a small area east of Hot Springs in Arkansas, USA. Origins...

Nick

14-Nov-2020 sharpening

Latest Posts

Honda CT90 - cam chain tensioner

all about the CT90 cam chain tensioner...

all about the CT90 cam chain tensioner...

Nick

23-Nov-2025 Honda CT90

Honda CT90 - ignition

an overview of how the CT90 ignition system works...

an overview of how the CT90 ignition system works...

Nick

30-Oct-2025 Honda CT90

CT90 frame and rear suspension

All about the frame and rear suspension...

All about the frame and rear suspension...

Nick

20-Oct-2025 Honda CT90

Honda CT90 - lighting

all about CT90 lighting...

all about CT90 lighting...

Nick

18-Oct-2025 Honda CT90

Honda CT90 - wheels, brakes and cables

all you ever wanted to know about the CT90's wheels, brakes and so on....

all you ever wanted to know about the CT90's wheels, brakes and so on....

Nick

15-Mar-2025 Honda CT90

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 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...

Nick

10-Feb-2025 Honda CT90

Recent articles

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......

Like many small bikes of this era, CT90s were not fitted with a regulator to control the amount of charge going to the battery......

Nick

26-Jan-2025 Honda CT90

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 ......

The steering head uses loose ball bearings - if you are replacing them you have an option to use tapered roller bearings instead ......

Nick

19-Jan-2025 Honda CT90

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...

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...

Nick

16-Jan-2025 Honda CT90

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......

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......

Nick

12-Jan-2025 Honda CT90

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...

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...

Nick

06-Dec-2024 Honda CT90

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. Although almost identical to the K1 model, the first replacement (below) I aqcuired is actually from a...

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...

Nick

05-Dec-2024 Honda CT90

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...

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...

Nick

02-Dec-2024 Honda CT90

New - Transmission Ghost theme

I developed the theme used on this site from scratch and have made it available as free open source software....

I developed the theme used on this site from scratch and have made it available as free open source software....

Nick

09-Nov-2024 website hosting

Honda C90 6v wiring diagrams

Here are copies of the colorised wiring diagrams I created, based on the original Honda black and white diagram for the UK-market 1978-82 C90. Earlier diagrams are available below. If you aren't familiar with reading this type of diagram (it is not has hard as it first appears!) then you can read more...

Here are copies of the colorised wiring diagrams I created, based on the original Honda black and white diagram for the UK-market 1978-82 C90. Earlier...

Nick

08-Nov-2024 C90 electrics

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