2 Namura .020 Over Bore Piston Kits for Ski-Doo 1000 4-Strokes 2003-2006 100.5mm

2 Namura .020 Over Bore Piston Kits for Ski-Doo

These two Namura .020 over bore piston kits are designed for use in Ski-Doo 1000 4-stroke engines from 2003 to 2006, offering a 100.5mm bore size with rings, pins, and circlips included for a complete top-end rebuild.

Overview

Each Namura .020 over bore piston kit is precision-machined from high-silicon aluminum alloy and paired with a compatible ring set to restore compression and power in Ski-Doo 1000 4-stroke engines. This two-kit set covers both cylinders, making it a convenient solution for engines requiring a .020 over bore (100.5mm) during rebuilds on 2003-2006 models.

Built For Performance

• High-silicon aluminum alloy construction for thermal stability and reduced expansion
• Precision-machined wrist pin bores and ring grooves for accurate fit
• Includes rings, wrist pins, and circlips per piston
• .020 over (100.5mm) size accommodates worn cylinder walls
• Matched set of two kits ensures consistent compression across both cylinders

Fits These Machines

• for Ski-Doo 1000 4-Stroke (2003-2006)

On-The-Job Use

• Rebuilding top ends on high-mileage Ski-Doo 1000 snowmobile engines
• Restoring lost compression and reducing oil consumption after cylinder wear
• Performing a .020 over bore to refresh an engine block with light scoring
• Replacing worn pistons during full engine overhaul for performance or reliability

Specs At A Glance

Good To Know

Q: Do I need to have my cylinders bored to use these pistons? A: Yes, these .020 over pistons require the cylinders to be bored to 100.5mm by a qualified machinist to achieve proper piston-to-wall clearance.

Q: Are the rings pre-gapped? A: Rings are supplied standard and should be checked and adjusted to the specified end gap for your engine during installation.

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