Description
Wiseco HD Milwaukee 8 CVO 121cid 11.0:1 CR (X) Piston
Wiseco® Black Edition Piston Series equipped with ArmorX™ piston coating and ArmorFit™ skirt coating adding superior protection in extreme conditions, reduced wear.
Additional Information
Wiseco Black Edition V-Twin. Piston Kit, 4.125 in. Bore, 11:1 CR
Part Type
Engine Piston Set
Product Overview
Wiseco HD Milwaukee 8 CVO 121cid 11.0:1 CR (X) Piston
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 09:44:49
Features
- ArmorFit skirt coating allows forged piston to be installed at tighter clearance, conforming to the cylinder bore through normal operation for ideal performance with less guesswork
- ArmorX coating applied to piston crown, ring grooves, and pin bore through proprietary electrochemical process and materials
- Engineered, forged, and machined in the USA in Mentor, OH
- Greatly increased resistance to wear and damage caused by heat and detonation plus resists ring microwelding
- Ideal for high-performance environments - from natural aspiration to power adders
- Kits include ring packs, wrist pins, and circlips
- Remains durable in high load, high cylinder pressure, high heat environments
- Various compression ratios and bore sizes available off the shelf to fit specific builds
Note for Pistons, Rings, Rotors, Rods and engine internals
Unless otherwise specified, some brands supply brake rotors, pistons, strut mounts, rods and rings separately. In some cases, titles may indicate plural, or 'set' - eg the term “ring set” often refers to the rings for a single piston only. If you’re unsure about what’s included with this product, please contact our team for clarification.
(keyword: piston)Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
Specifications
Product Details
| Description: | Wiseco HD Milwaukee 8 CVO 121cid 11.0:1 CR (X) Piston |
| Part Number: | wisK2801 |
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Wiseco, WISECO-PRO TRU |
| StreetFX SKU | wisK2801 |
| SFX Item ID | 4064646 |
| Accounting SKU | wis-K2801 |
| Manufacturer SKU | K2801 |
| Manufacturer UPC | 193564150448 |
| Alternative References | K2801, WIS-K2801 |
Engine Piston Set, HD Milwaukee 8 CVO 121cid 11.0:1 CR (X)
Wiseco offers Black Edition V-Twin piston kits for a wide range of Harley-Davidson® street bikes. They feature forged aluminum pistons with ArmorX coating for reduced wear and superior protection in extreme conditions. An ArmorFit skirt coating auto-adjusts to the cylinder wall (so there's no need to measure clearance), providing smooth, quiet, trouble-free operation. The pistons are available in a variety of bore sizes and other options. Order the kit recommended for your motorcycle.
Additional product details:
• Dome design for improved flame travel to maximize air/fuel burn efficiency
• High compression (11:1) for added power
• Superfinish piston pin reduces friction and improves scuff resistance
• Enhanced pin oiling for improved lubrication and reduced friction
• Augmented ring land details improve ring seal and function
• Dedicated rings for precise fit, improved compression, and oil control
• Kits include two pistons, rings, piston pins, and circlips
| Product Attributes | |
|---|---|
| Brand | Wiseco |
| Manufacturer's Part Number | K2801 |
| Part Type | Powersports Piston and Ring Kits |
| Product Line | Wiseco Black Edition V-Twin Piston Kits |
| UPC | 193564150448 |
| Piston Material | Forged aluminum |
| Bore (in.) | 4.125 in. |
| Bore (mm) | 104.775mm |
| Wrist Pin Style | Floating |
| Pin Diameter (in.) | 0.927 in. |
| Wrist Pin Retainers Included | Yes |
| Top Ring Material | Steel |
| Second Ring Material | Steel |
| Oil Ring Material | Stainless steel |
| File Fit | No |
| Gapless | No |
| Gaskets Included | No |
| Quantity | Sold as a kit. |
| Manufacturer Attributes | |
|---|---|
| Piston Diameter | 4.122 |
| Bore Diameter | 4.125 |
| Product Series | Black Edition V-Twin Series |
| Engine Type | ICE |
| Included Components | Piston #40225PS, Ring Set #4125VMF, Wrist Pin #927-2500-15-52C, CirClip #W5752 |
| Product Type | Piston Kits |
| Industry | Powersports |
| Product Market | V-Twin |
| Title | Wiseco Black Edition V-Twin Piston Kit, 4.125 IN Bore, 11:1 CR |
| Title - Web | Wiseco Black Edition V-Twin. Piston Kit - 4.125 in. Bore |
| Skirt Coating | Yes |
| Out of Stock Message | Estimated Shipped Date 3-4 Weeks |
| Category Hierarchy | Powersports>Pistons>Piston Kits>V-Twin Engine Piston Kits |
| Manufacturer Designation | HD Milwaukee 8 CVO 121cid 11.0:1 CR (X) |
| Product Class | Engine Piston Set |
| Construction/Type | Wiseco Black Edition V-Twin. Piston Kit, 4.125 in. Bore, 11:1 CR |
| Product Outline | <ul><li>Engineered, forged, and machined in the USA in Mentor, OH</li><li>ArmorX coating applied to piston crown, ring grooves, and pin bore through proprietary electrochemical process and materials</li><li>Greatly increased resistance to wear and damage caused by heat and detonation plus resists ring microwelding</li><li>Ideal for high-performance environments - from natural aspiration to power adders</li><li>Remains durable in high load, high cylinder pressure, high heat environments</li><li>ArmorFit skirt coating allows forged piston to be installed at tighter clearance, conforming to the cylinder bore through normal operation for ideal performance with less guesswork</li><li>Various compression ratios and bore sizes available off the shelf to fit specific builds</li><li>Kits include ring packs, wrist pins, and circlips</li></ul> |
| Vehicle Brief | HD Milwaukee 8 CVO 121cid 11.0:1 CR (X) |
| Market Description | Wiseco Black Edition pistons are designed and built to be the ultimate in piston performance and durability for Harley-Davidson engines. Introducing proprietary, industry first coatings, Black Edition pistons perform as good as they look. Wiseco's ArmorX coating protects critical areas of the piston for miles and miles of riding, while ArmorFit skirt coating helps reduce engine noise and friction. Equip your performance Harley build with the American-made pistons it deserves. |
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