What does '0.040 inch undersize' mean for this piston?

This piston is 0.040 inches smaller in diameter than its standard size. It's meant to be used in an engine cylinder that has been machined (bored) to match this specific undersize dimension, typically during an engine rebuild.

Is this piston compatible with all Polaris XP 850 SPORT models?

This piston is specifically designed for the Polaris XP 850 SPORT engine. It is crucial to ensure your engine's specifications match the requirements for this 0.040 inch undersize piston before installation.

What is the advantage of a forged piston over a cast piston?

Forged pistons are made by shaping aluminum alloy under extreme pressure, resulting in a denser, stronger, and more durable component. This makes them better suited to handle the higher stresses and temperatures found in performance or rebuilt engines compared to cast pistons.

JE Pistons Forged Piston 308410S

Name: JE Pistons Polaris XP 850 SPORT Piston Single
Brand: JE Pistons
SKU: je-pistons-je-pistons-polaris-xp-850-sport-piston-single-t14-695525
Price: 314.99 USD
Availability: BackOrder

JE Pistons Polaris XP 850 SPORT Piston Single

$314.99

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

JE Pistons Polaris XP 850 SPORT Piston Single. This 0.040 inch undersize forged piston is built for improved performance.

Key Features

Fits Polaris XP 850 SPORT.
Single forged piston.
0.040 inch undersize.
Constructed from strong aluminum alloy.
Designed for engine rebuilds and performance applications.

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Product Details

This JE Pistons 308410S is a single forged piston, specifically sized at 0.040 inch undersize. It's built for the Polaris XP 850 SPORT engine, offering a well-built component for those looking to rebuild or upgrade their engine's internals. Forged pistons are known for their strength and ability to handle higher performance demands compared to cast pistons.

Crafted from strong aluminum alloy, this piston is designed to withstand the rigors of an engine operating at higher pressures and temperatures. The 0.040 inch undersize specification means it's intended for cylinders that have been bored out to match this dimension, often done during an engine rebuild to restore proper cylinder wall finish and piston-to-wall clearance. This ensures a good seal and efficient operation.

When rebuilding your Polaris XP 850 SPORT engine, using a forged piston like this one from JE Pistons is a solid option for durability and performance. Always ensure your engine block is properly machined to the correct clearance for this piston size before installation.