About the Yamaha IT250
Fork, swingarm, brake and clutch service for Yamaha’s two-stroke IT250 enduro.
Yamaha introduced the 1977 IT250 as a competition enduro with a 246cc two-stroke single, five-speed wide-ratio transmission, CDI ignition and Monocross rear suspension. Its off-road purpose makes suspension, pivot bearings and controls central to a practical restoration.
Use fork dimensions and clutch year groups to narrow the parts
The listed service parts divide into useful groups: 36 × 48 × 10.5 fork seals and an early steel clutch plate for 1977–80; two 38 × 50 seal profiles for 1981–82; and a 43 × 55 × 10.5 fork-seal pair listed for 1983–85. The later steel clutch plate lists 1981–85. These are product applications; replacement forks or engines need their own identification.
IT250 service-part applications by year
The year groups below describe current service-part applications. Keep the original market and any fitted replacement assemblies in view.
1977–80 applications
Early fork and clutch service
The early fork-seal pair is 36 × 48 × 10.5. A separate steel clutch plate and drum-brake shoe listing cover these years. Brake position and clutch quantity still need to be confirmed.
1981–82 applications
Two 38 mm seal listings
The catalog lists both 38 × 50 × 10.5 and 38 × 50 × 8/9.5 options for these years. Their heights differ; match the original seal and fork seat before choosing.
1983–85 applications
Later 43 mm fork-seal listing
The later listed pair is 43 × 55 × 10.5. The later steel clutch plate has its own 1981–85 application. Neither product extends the earlier brake-shoe coverage.
Check the motorcycle and its componentsYamaha IT250 frame, engine & model checklist
Use these checks with Yamaha documentation for the original market. Frame and engine identity does not prove every fitted component is original.
- Year, model and engine. Read the full frame and engine markings with original-market Yamaha documentation. An engine replacement can change the clutch parts required.
- Fork assembly. Measure the old seal’s inside diameter, outside diameter and full height/profile. Photograph any markings and the retaining arrangement; replaced forks must be serviced by their own identity.
- Brakes and pivot parts. Identify front or rear drum position, shoe dimensions and pivot/cam ends. For swingarm work, compare bearing and spacer dimensions and inspect the seals separately.
Ask the PartsNMore team with the full model, year, original market if known, and clear photos of the markings and component.