Namura Standard Bore Size A Top End Repair Kit for Yamaha YZ250 1992-1994 68mm
Namura Standard Bore Size A Top End Repair Kit for Yamaha YZ250 1992-1994 68mm
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Namura Standard Bore Size A Top End Repair Kit for Yamaha YZ250 1992-1994 68mm
This top end repair kit rebuilds the cylinder assembly of Yamaha YZ250 two-stroke motorcycles, providing piston, rings, pin, and bearings to restore lost compression and power. It is designed for the 1992-1994 YZ250 and includes size A components with a 68mm bore.
Overview
The Namura Standard Bore Size A Top End Repair Kit is a complete piston and ring set designed for the Yamaha YZ250 from 1992 to 1994. It replaces worn top end parts to revive engine performance and reliability. This kit is a direct-fit solution for riders wanting to refresh their top end without machining.
Built For Performance
- Premium 68mm piston with advanced skirt coating reduces friction
- Moly‑coated rings provide excellent cylinder seal and longevity
- Precision‑ground wrist pin and c‑clip bearings included
- Size A grading ensures proper clearance within factory specifications
- Kit includes both needle bearing and thrust washer for complete rebuild
Fits These Machines
- for Yamaha YZ250 1992
- for Yamaha YZ250 1993
- for Yamaha YZ250 1994
On‑The‑Job Use
- Motocross track racing requiring high‑rev reliability
- Off‑road trail and enduro riding demanding consistent power
- Rebuilding a high‑hour engine to restore original performance
- Competition or recreational two‑stroke maintenance
Specs At A Glance
| Bore Size | 68 mm |
| Size Grade | A |
| Application | Yamaha YZ250 1992‑1994 |
| Engine Type | 2‑Stroke Single Cylinder |
Good To Know
Q: Do I need to rebore my cylinder for this kit? A: No, the Size A piston is designed for a standard bore cylinder that is within factory wear limits. Measure your cylinder before ordering to confirm it still meets spec.
Q: Does this kit include a gasket set? A: The kit contains the piston assembly, rings, pin, and bearing but does not include a base gasket or cylinder head gasket. Those should be purchased separately for a proper rebuild.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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