Namura .020 Over Bore Top End Repair Kit for Yamaha YZ250 1999-2001 66.9mm
Namura .020 Over Bore Top End Repair Kit for Yamaha YZ250 1999-2001 66.9mm
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Namura .020 Over Bore Top End Repair Kit for Yamaha YZ250
This Namura .020 over bore top end repair kit provides replacement piston, rings, wrist pin, and gaskets to restore compression and performance on Yamaha YZ250 models from 1999 to 2001.
Overview
The Namura .020 over bore top end repair kit is a complete overhaul solution for the cylinder on Yamaha YZ250 two-stroke engines. It includes a precision-machined piston and ring set tailored to the 66.9mm bore size. This kit is ideal for riders restoring power to their 1999-2001 YZ250.
Built For Performance
- Includes piston, rings, wrist pin, circlips, and top-end gaskets
- .020 over bore size for refreshed cylinder clearance
- Heat-treated steel rings for consistent sealing
- Direct replacement design for YZ250 1999-2001
- Namura quality construction meets OEM specifications
Fits These Machines
- for Yamaha YZ250 1999
- for Yamaha YZ250 2000
- for Yamaha YZ250 2001
On-The-Job Use
- Motocross racing
- Trail riding
- Enduro competition
- Track day practice
Specs At A Glance
| Brand | Namura |
| Bore Size | 66.9mm |
| Oversize | .020 in |
| Compatible Models | Yamaha YZ250 (1999-2001) |
Good To Know
Q: Does this kit include everything needed for a top-end rebuild? A: Yes, it contains piston, rings, wrist pin, circlips, and all required gaskets for a complete replacement.
Q: Can I reuse the cylinder after installing this over bore kit? A: The cylinder must be bored or honed to the matching .020 over size before installation for proper clearance.
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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