Namura .040 Over Bore Top End Repair Kit for GAS GAS MC125 2002-2007 55mm

Namura .040 Over Bore Top End Repair Kit for GAS GAS

This Namura top end repair kit with .040 over bore (55mm) rebuilds the cylinder and piston assembly for GAS GAS MC125 motorcycles from 2002 to 2007. It includes piston, rings, pin, and gaskets to restore compression and power.

Overview

This Namura .040 over bore top end repair kit is engineered for GAS GAS MC125 two-stroke dirt bikes, providing a complete cylinder rebuild solution. The kit includes a cast piston with rings, wrist pin, circlips, and a full gasket set, allowing you to refresh the top end and regain lost performance. Specifically sized at 55mm bore for .040 over, it matches the oversize required for worn cylinders.

Built For Performance

• Namura cast piston offers reliable strength and thermal stability
• Precision-machined ring grooves ensure proper seal
• Includes .040 over bore specification for worn cylinder restoration
• Complete gasket set eliminates separate purchases
• Lightweight piston design reduces reciprocating mass for quicker throttle response

Fits These Machines

• for GAS GAS MC125 2002
• for GAS GAS MC125 2003
• for GAS GAS MC125 2004
• for GAS GAS MC125 2005
• for GAS GAS MC125 2006
• for GAS GAS MC125 2007

On-The-Job Use

• Motocross and off-road racing
• Trail riding and enduro events
• Engine rebuilds and top-end overhauls

Specs At A Glance

Good To Know

Q: Do I need to replate my cylinder when using a .040 over bore kit? A: For a .040 over bore, you must have the cylinder bored and honed to the correct size by a qualified machine shop before installation.

Q: Should I replace the crank bearings when doing a top end? A: While not always required, it is wise to inspect the lower end for play; if the crank has significant hours, replacing the bearings is recommended.

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