About the Honda CT90 Trail 90
Use the Trail 90’s engine, fork and intake layout to identify the restoration project.
The Trail 90 name spans more than one engine design. Honda’s CT200 used an 87 cc overhead-valve engine; the CT90 introduced an overhead-cam engine in 1966. Early CT90s retained two rear sprockets, while the later K0 used an auxiliary transmission. Identify the engine itself before choosing a gasket or carburetor part.
The 1969 change affects more than the front fork
Honda’s 1969 K1 brought telescopic forks, a rear-facing carburetor and a side-mounted air cleaner. These are useful checks when a bike is advertised simply as a “Trail 90.” Use this family page to identify the model; the CT90K repair page compares the actual parts and package details.
Identification and parts selectionCT90 generation clues before choosing parts
| Model or assembly | Identifying detail | What it changes |
|---|---|---|
| CT200 predecessor | 87 cc overhead-valve engine. | A Trail 90 badge does not establish CT90 engine fitment. |
| Early CT90 K0 | Overhead-cam engine, bottom-link front suspension; early examples use two rear sprockets. | Identify the fitted carburetor before using the 1966–1968 kit. |
| Later K0 | Auxiliary transmission replaces the double-sprocket arrangement. | Record which transmission and engine are actually fitted. |
| 1969 K1 | Telescopic fork, revised intake orientation and air-cleaner location. | The early carb kit does not list 1969. |
| 1970 K2 / 1972 K4 | K2 adds swivel-lock handlebars; K4 adds the auxiliary fuel tank. | Useful restoration clues; replacement accessories do not prove model year. |
| 1974 K5 onward | Indicators become standard on the U.S. K5; later CT90 models continue through 1979. | Check the bike’s identifiers and the separate application of every electrical or service part. |
Reference: Honda CT history and model changes.
Identify your motorcycle before orderingCT90 Trail 90 identification checklist
Record the bike and the assembly being repaired.
- Copy complete frame and engine markings without dropping prefixes.
- Photograph the front suspension and transmission arrangement as identification clues.
- Record the fitted carburetor’s markings before selecting fuel-system parts.
Contact PartsNMore with the model year, frame and engine markings, and clear photos of the component being repaired.