Yamaha Primary Sheave Bolt Set XS500 GP338 SL338 ET250 12mm-1.25
Part Number: 838-17647-01 (Supersedes to 838-17647-01-00)
Condition: Brand New in Original Yamaha Packaging (NOS)
Specs: 12mm x 1.25 Thread | Genuine Japanese Steel
Condition: Brand New in Original Yamaha Packaging (NOS)
Specs: 12mm x 1.25 Thread | Genuine Japanese Steel
Product Overview
This listing is for a matched set of two (2) genuine Yamaha primary sheave bolts. These are New Old Stock (NOS), meaning they are original factory parts from the 1970s that have never been installed. For vintage restoration projects, these OEM bolts provide the exact tensile strength and thread pitch (1.25) required for the primary clutch and sheave assemblies.
Vehicle Fitment (1971–1979)
These bolts are a direct fit for the following Yamaha vintage snowmobiles and motorcycles:
Vintage Snowmobiles:
- GP Series: GP292, GP300, GP338, GP433, GP440
- SL Series: SL292, SL338, SL396, SL433
- ET Series: Enticer 250 (ET250)
- Additional Models: GS300, GS340, EW433, EL433, SW433, PR292, PR440
Motorcycles:
- Yamaha XS500: 1976, 1977, 1978 models
Key Features
- OEM Integrity: Not a generic hardware store bolt; these are specific Yamaha drive-train components.
- Precision Threading: 1.25 fine pitch ensures a secure fit in the primary sheave.
- Collector Quality: Perfect for concourse-level restorations where original markings and finishes matter.
- Original Packaging: Ships in the original Yamaha Motor Co. plastic bag as shown.
selling as pictured.
more than welcome to pick up at shop in butler pa & save shipping.
033026 jy