Namura Standard Bore Top End Repair Kit for Yamaha PW50 fits 1990-2024 40mm

Namura Standard Bore Top End Repair Kit for Yamaha PW50

This top end repair kit provides all necessary components to rebuild the cylinder and piston assembly on a Yamaha PW50, featuring a standard 40mm bore size.

Overview

The Namura Standard Bore Top End Repair Kit is a complete overhaul solution for the Yamaha PW50's top end. This kit includes a piston, rings, wrist pin, and gaskets to restore engine compression and performance. Designed for the 40mm standard bore, this top end repair kit ensures a precise fit for 1990-2024 models.

Built For Performance

• Includes a cast aluminum piston with reinforced skirt for durability
• Features moly-coated rings to reduce friction and improve sealing
• Supplied with a high-strength wrist pin and circlips for secure assembly
• Complete gasket set includes head, base, and exhaust gaskets
• Precision-machined to factory specifications for exact fitment

Fits These Machines

• for Yamaha PW50 (1990-2024)

On-The-Job Use

• Used for rebuilding the top end of a Yamaha PW50 youth dirt bike
• Restores lost compression and power after extended use
• Ideal for DIY mechanics and professional shop repairs
• Ensures smooth engine operation for trail riding and practice
• Commonly needed after piston and ring wear over time

Specs At A Glance

Good To Know

Q: Does this kit include a cylinder? A: No, this top end repair kit includes the piston, rings, wrist pin, and gaskets; the cylinder must be reused or replaced separately.

Q: Is the piston standard size? A: Yes, the piston is standard 40mm bore and not oversized, so it fits stock cylinders within factory specifications.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.