JE Pistons Piston Kit - 4.250" - 10.25:1 CR - 114"/117" M8 [394138]

MSRP: $729.99

$604.90

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Manufacturer Part Number:

394138

Parts Unlimited Part Number:

09106856

Parts API Product ID:

0817772017

Parts Status:

Product Type:

Piston & Ring Kits

Parts Fitment Count:

Parts Ranked 6-10 Batch:

PARTS_RANKED_6_10_FREEDOM_PROCESS_20260818

Parts Ranked 6-10 Plan SHA256:

0E737D73F31BA19CCC427CEA069742C5CE045E455EBF2CA92AE250124E6A2894

Parts Sealed Image SHA256:

31E916A75D0C424FE796C20BEDCBA4D3163268B81C1418BE7325C19A67773C4A

JE Pistons Piston Kit - 4.250" - 10.25:1 CR - 114"/117" M8 [394138]

Manufacturer Part Number: 394138

Parts Unlimited Part Number: 09106856

Product Type: Piston & Ring Kits

Piston Kit - 4.250" - 10.25:1 CR - 114"/117" M8

Compression Ratio: 10.25:1
Units: Kit
Bore Size: 4.250"
Stroke Length: 4.500"
Model: Ultra Series
Product Name: Piston Kit
Piston Head Shape: Dished
Skirt Coating: Tuff Skirt
Bore - Oversize: Standard
Type: Forged Side Relief Design
Piston Material: Forged 2618 Aluminum
Riding Style: Street
Propriety aligned grain flow forging technology for maximum tensile strength suited for high performance enviroment
Cermic crown coating protects the piston by reducing heat transfer
Internal and external bracing maintains optimized strength-to-weight ratio for longevity
3D undercrown milling in non-critical areas reduces overall weight
Lateral gas ports and accumulator groove maintain power-producing ring seal even at high RPM and high boost
Tuff Skirt is a propriety, moly based dry film skirt coating that is applied in-house and reduces operating friction for better wear resistance
Offset pin reduces piston rock and minimize engine operating noise
Skirt notches for optimal clearance at the bottom dead center
Kit includes two pistons, premium ring pack, wrist pins and wire locks