Wiseco Yamaha YZ125 05-20 GP Series(846M05400) Piston

SKU: WISPK1390

Powersports Piston and Ring Kits

WIS Powersports Single Pistons

Wiseco

Wiseco Yamaha YZ125 05-20 GP Series(846M05400) Piston

SKU: WISPK1390

Powersports Piston and Ring Kits

WIS Powersports Single Pistons

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

Wiseco's GP Series forged 2-stroke pistons build on the tried-and-true base of the Pro-Lite. Wiseco GP Series 2-stroke pistons incorporate additional performance and durability enhancing features including an Electra-Coated crown, ring groove(s), and pin bores plus ArmorGlide skirt coating, making them perfect for endurance and sustained-RPM 2-stroke applications. From play riders putting in hard hours to consistent competition, GP Series 2-stroke pistons are up to the challenge.

Part Type

Engine Piston Set

Data: v4.2 - Upd: 2026-09-30 17:38:30

Features

54.00 mm Bore
ArmorGlife skirt coating reduces friction to optimize performance potential
Dedicated forgings and additional lightening operations allow for optimized strength-to-weight ratio
Designed and built for each specific 2-stroke powersports engine
Designed for endurance and sustained-RPM 2-stroke riding
Designed with optimized features for long service life and top-end power
Electra-Coated crown, ring groove and pin bore resists potential wear, combustion heat damages, and ring micro-welding
Engineered, forged, and machined in the USA in Mentor, OH
Extra lightening operations for enhanced throttle response
High-quality ring(s), wrist pin(s), and circlips included
Improved tensile strength of forged material optimizes strength and service life
Includes high-quality piston ring(s), wrist pin(s), and circlips

Specifications

Product Attributes - Brand: Wiseco
Product Attributes - Manufacturer's Part Number: PK1390
Product Attributes - Part Type: Powersports Piston and Ring Kits
Product Attributes - Product Line: Wiseco Racers Choice GP-Series Piston Kits
Product Attributes - UPC: 00193564152145
Product Attributes - Piston Material: Forged aluminum
Product Attributes - Bore (mm): 54.000mm
Product Attributes - Stroke: 54.50mm
Product Attributes - Wrist Pin Style: Floating
Product Attributes - Pin Diameter (in.): 0.591 in.
Product Attributes - Wrist Pin Retainers Included: Yes
Product Attributes - Top Ring Thickness: 1.0mm
Product Attributes - Top Ring Material: Steel
Product Attributes - Top Ring Facing Material: Chrome
Product Attributes - File Fit: No
Product Attributes - Gapless: No
Product Attributes - Gaskets Included: Yes
Product Attributes - Quantity: Sold as a kit.
Product Attributes - Notes: Features no intake window. Upper connecting pin position is on centerline.

Reference Information

Brand Name/s	Wiseco
StreetFX SKU	wisPK1390
SFX Item ID	4068446
Supplier Item Code	4068446
Manufacturer SKU	PK1390
Manufacturer UPC	193564152145
Alternative References	YZ125, Series(846M05400)