84-99 HARLEY EVO REVOLUTION PERFORMANCE 109" PISTON KIT 10:1 | NEW | RP301-518W

1984-1999 Harley-Davidson Evolution Revolution Performance 109" Big Bore Piston Kit | 10.0:1 Flat Top | NEW | Part #RP301-518W

Offered here is a brand new genuine Revolution Performance 109" big bore piston kit, Part #RP301-518W, also sold as Drag Specialties Part #0910-6388. This is the replacement piston kit for the Revolution Performance Big Bore Kit on 109" Harley-Davidson Evolution Big Twin builds. It is designed for a 3-7/8" bore with a 4-5/8" stroke, and its flat-top pistons produce a 10.0:1 compression ratio for strong street performance. Use it to refresh a tired 109" top end or to replace worn or damaged pistons in a Revolution-equipped Evo.

The 109" combination uses the same 3-7/8" Revolution big bore as the 100" kit, paired with a 4-5/8" stroker bottom end instead of the stock 4-1/4" Evo stroke. The longer stroke requires a different piston, so Part #RP301-518W is specific to 109" builds and is not interchangeable with the 100" piston kit, Part #RP301-214W.

Confirmed Fitment – Part #RP301-518W:

• 1984-1999 Harley-Davidson Evolution Big Twin engines built to 109" with Revolution Performance 3-7/8" Big Bore cylinders and a 4-5/8" stroke flywheel assembly
• 1984-1999 Harley-Davidson Softail Evolution models
• 1991-1998 Harley-Davidson Dyna Evolution models
• 1984-1998 Harley-Davidson Touring FLH / FLT Evolution models
• 1984-1994 Harley-Davidson FXR Evolution models
• Required: Revolution Performance Big Bore cylinders. Not recommended for cast-iron or ductile-sleeved cylinders
• Required: 4-5/8" stroke flywheel assembly. Not for stock 4-1/4" stroke Evo engines

Product Highlights:

• 100% Genuine Revolution Performance – Part #RP301-518W
• Drag Specialties cross-reference – Part #0910-6388
• 109" displacement
• 3-7/8" bore size
• 4-5/8" stroke length
• 10.0:1 compression ratio
• Flat-top piston head design
• Custom-forged pistons made from high-strength aluminum alloy
• Skirt-coated pistons with high-tension compression rings and 3mm oil scraper rails
• Offset pin design for smoother operation
• Built for greater operating strength and lower expansion at high temperatures
• Designed for high-performance street use
• Made in the U.S.A.

What Is Included:

• Revolution Performance piston kit, Part #RP301-518W: pistons with skirt coating, rings, chrome piston pins, and retainer clips

Search Keywords:

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Please confirm Part #RP301-518W fits your motorcycle, cylinders, and stroke before purchase. Your order ships quickly and securely with full tracking from our warehouse. Buy with confidence: this is genuine Revolution Performance, brand new, and shipped from inventory we have on hand.

Upgrade your engine with the REVOLUTION PERFORMANCE, LLC Piston Kit designed specifically for 109-inch Evolution engines. This replacement piston kit offers a reliable solution to restore or enhance engine performance, ensuring smooth operation and durability. Constructed with high-quality materials, the kit is engineered to withstand the rigors of high-performance applications while maintaining precise fit and finish. Installation is straightforward, making it an ideal choice for mechanics and enthusiasts seeking to replace worn or damaged pistons without extensive modifications. The kit includes all necessary components for a complete rebuild, providing a cost-effective way to maintain engine integrity and prolong service life. Durability and performance are at the core of this piston kit, featuring precision machining and compatible design to ensure optimal combustion and power delivery. Whether you are rebuilding your engine or upgrading for better performance, the REVOLUTION PERFORMANCE, LLC Piston Kit is a dependable choice to keep your 109-inch Evolution engine running at its best. Features: Replacement piston kit designed for 109-inch Evolution engines High-quality construction for durability and reliable performance Includes all necessary components for a complete rebuild Precision machining ensures optimal fit and function Engineered for easy installation and long-lasting use