128" Power Package Engine Performance Kit

S&S CYCLE 128" Power Package Engine Performance Kit

S&S CYCLE
0904-0094
310-1107B
Enhance your Harley-Davidson's performance with the 128" Power Package Engine Performance Kit, featuring a big-bore design that increases engine capacity and efficiency without case machining.
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€2,559.61
This product is currently unavailable.
  Delivery policy

In stock items will be shipped within 1-3 days.

  Return policy

You can return the products within 14 days for a full refund, check our returns policy.

128" Power Package Engine Performance Kit

Unlock the potential of your Harley-Davidson with the 128" Power Package Engine Performance Kit. This big-bore bolt-on kit seamlessly increases your 114" or 117" M-Eight engine without the need for case machining.

  • Features 4-1/4" bore cylinders paired with 11:1 forged pistons for enhanced performance.
  • Equipped with an S&S oil pump/cam plate boasting a blue anodized finish.
  • Serviceable passage plugs make maintenance a breeze.
  • Independent scavenge sections ensure efficient oil management for both the flywheel cavity and cam chest.
  • Debris screens and a cam chest magnet protect your oil pump from contaminants.
  • Increased oil flow capacity improves engine performance on both oil feed and scavenge sides.
  • Adjustable pressure relief valve allows for fine-tuning while installed in the engine.
  • Includes Quickee pushrods with chrome pushrod tubes for durability.
  • Comes with S&S premium tappets and hard-anodized, black coated tappet cuffs for improved stability in high-lift, high-rpm scenarios.
  • Designed with S&S 550 cams optimized for big bore applications.
  • Compatible S&S valve springs support cams with up to .605" lift.
  • High-performance conical single-wire spring design maximizes efficiency.
  • All necessary gaskets, bearings, and hardware for a straightforward bolt-on installation are included.
  • Made in the U.S.A.
: 0904-0094
In Stock

Data sheet

Riding Style
Street
Type
Engine
Units
Kit
Color/Finish
Black Granite
Highlighted Fins
Style
Big Bore
Bore Size Imperial
4.250"
Stroke Length Imperial
4.50"
Compression Ratio Imperial
11.1:1
Displacement
128"
Cooling System
Oil Cooled
Water Cooled
Cam Drive Type
Chain

Shipping Policy

Shipping Areas:

We ship to:

  • Spain (Peninsula and Balearic Islands)
  • European Union countries

We do not ship to the Canary Islands, Ceuta, or Melilla.

Shipping Times:

  • Spain (Peninsula): 2–4 business days
  • Balearic Islands: 3–5 business days
  • EU countries: 3–7 business days depending on destination

Shipping Costs:

Shipping costs are calculated automatically at checkout based on destination and weight.

Free shipping may be offered for qualifying orders, as specified on our website.

Order Processing:

Orders are processed within 1–2 business days after payment confirmation. Orders placed on weekends or public holidays are processed the next business day.

Delivery Issues:

If your order is delayed or arrives damaged, you must notify us within 14 calendar days. We will investigate the issue and offer a resolution in accordance with applicable consumer protection laws.

Return & Withdrawal Policy

Right of Withdrawal:

In accordance with Royal Legislative Decree 1/2007 (Ley de Defensa de los Consumidores y Usuarios), you have the right to withdraw from your purchase within 14 calendar days from the date of receipt, without giving any reason.

To exercise this right, contact us via email or through our website, providing your order number and contact details.

Return Conditions:

  • Products must be unused, in original condition and packaging.
  • Return shipping costs are the responsibility of the customer, unless the product is defective or sent in error.
  • Refunds will be issued within 14 days of receiving the returned goods.

Items Excluded from Return:

  • Custom or personalized products
  • Sealed items that were unsealed after delivery and are unsuitable for return due to hygiene (e.g. cosmetics, personal care)
  • Digital content delivered electronically once download or streaming has begun

If you want to return an item, please contact us first to give you detailed instructions.