How many pistons do I need for my Harley-Davidson Evo 1340 engine?

The Harley-Davidson Evo 1340 engine typically uses two cylinders, and therefore two pistons. This part is sold individually, so you will need to order two of these pistons for a complete engine rebuild.

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

Forged pistons are made by heating aluminum alloy and hammering it into shape under extreme pressure. This process creates a denser, stronger grain structure compared to cast pistons, making them more resistant to detonation, heat, and stress, which is ideal for performance applications.

Does this piston come with rings or wrist pin?

This JE Pistons part number 133731S is for the piston only. It does not include piston rings or a wrist pin. You will need to purchase these separately if they are not included with your other engine rebuild components.

JE Pistons Forged Piston 133731S - Harley-Davidson Evo 1340

Name: JE Pistons 3.498 Harley-Davidson Evo 1340 Piston Single
Brand: JE Pistons
SKU: je-pistons-je-pistons-3-498-harley-davidson-evo-1340-piston-single-t14-695078
Price: 314.99 USD
Availability: BackOrder

JE Pistons 3.498 Harley-Davidson Evo 1340 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 3.498 Harley-Davidson Evo 1340 Piston Single

Key Features

Fits Harley-Davidson Evo 1340 engines.
Forged aluminum alloy construction for increased strength and durability.
3.498 inch bore size for a precise fit.
Designed as a single replacement piston for engine rebuilds.
JE Pistons is a popular brand in performance engine building.

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Product Details

If you're rebuilding the top end of your Harley-Davidson Evo 1340 engine, a solid piston is key to getting it back on the road with reliable performance. This single forged piston from JE Pistons is built to handle the demands of that V-twin motor.

JE Pistons are well-known in the performance engine world, and this piston is forged from high-strength aluminum alloy. This forging process creates a denser, stronger part than cast pistons, making it more resistant to the heat and pressure generated inside your engine. It's designed to be a direct replacement for the stock piston, meaning it fits right into your existing cylinder bore without modification, assuming the bore is in good condition and within spec. The 3.498-inch bore size is specific to the Evo 1340 engine, ensuring proper fitment and compression ratio when paired with the correct cylinder head and gasket.

When rebuilding an engine, it's always a good idea to check your cylinder bore for wear and ensure it's perfectly round before installing new pistons. This piston is sold individually, so be sure to order the correct quantity for your engine.