2 Namura Size B Standard Bore Piston Kits for Polaris 850 ATV's 87mm

2 Namura Size B Standard Bore Piston Kits for Polaris

These two 87mm standard bore piston kits from Namura are designed as a direct replacement for Polaris 850 ATV engines, restoring compression and performance with each installation.

Overview

These Namura Size B standard bore piston kits provide a complete set of two pistons, rings, and wrist pins for rebuilding Polaris 850 ATV engines. Each kit is engineered to match OEM specifications, ensuring a precise fit and reliable operation. Ideal for mechanics and DIY enthusiasts tackling engine overhauls on Polaris 850cc ATVs.

Built For Performance

• 87mm bore diameter for standard Polaris 850 engine cylinders
• Durable cast aluminum alloy construction for long service life
• Includes piston rings and wrist pin for a complete rebuild
• Size B designation indicates precise clearance for proper fit
• Supports high-temperature operation in demanding ATV use

Fits These Machines

• for Polaris Sportsman 850
• for Polaris RZR 850
• for Polaris General 1000 (with 850 engine variant)
• for Polaris Scrambler 850

Specs At A Glance

Good To Know

Q: What is the difference between Size A and Size B? A: Size B pistons have a slightly larger diameter than Size A to accommodate minor cylinder wear, ensuring proper clearance during rebuilds.

Q: Are rings and pins included? A: Yes, each piston kit comes with rings and a wrist pin, providing all necessary components for installation.

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