Namura .040 Over Bore Piston Kit for Honda Fourtrax 300 2x4 & 4x4 1988-2000 75mm

.040 Over Bore Piston Kit for Honda

This .040 over bore piston kit replaces the original piston in Honda Fourtrax 300 models, providing a 75mm bore size for restoring compression and power in 2x4 and 4x4 configurations from 1988 through 2000.

Overview

This .040 over bore piston kit is a direct replacement for the Honda Fourtrax 300, designed to bring worn engines back to life with a precise 75mm bore. Ideal for riders rebuilding their 2x4 or 4x4 machine, this piston kit includes the piston, rings, and wrist pin for a complete top-end refresh.

Built For Performance

• Precision-machined from high-silicon aluminum alloy for durability
• Includes .040 over-sized rings for optimal cylinder sealing
• Factory-balanced design reduces vibration at high RPM
• Heat-treated wrist pin for long service life
• Compatible with standard 75mm bore cylinders

Fits These Machines

• for Honda Fourtrax 300 2x4 (1988-2000)
• for Honda Fourtrax 300 4x4 (1988-2000)

Specs At A Glance

Good To Know

Q: Will this piston kit fit my 1995 Fourtrax 300? A: Yes, the .040 over bore piston kit fits all 1988-2000 Fourtrax 300 models. Verify your cylinder bore is within spec to accept the 75mm piston.

Q: Do I need to re-bore the cylinder? A: Yes, a .040 over piston requires the cylinder to be bored to match the 75mm size. Always have your cylinder measured by a qualified shop before installation.

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