Wiseco 1200 Sportster 10.5:1 Compression Piston Kit - Harley Sportster
About Wiseco
Wiseco has forged pistons in Mentor, Ohio since 1941, supplying everything from factory race teams to big-bore street builds. Forged construction is what lets a V-twin survive higher compression and more cylinder pressure than the stock cast piston was designed for.
Upgrade your 1200cc Harley Sportster with this Wiseco forged piston kit, engineered to deliver a robust 10.5:1 compression ratio. These pistons are constructed from high-silicon aluminum with a diamond-turned finish, ensuring superior strength, efficient heat transfer, and reliable performance on every ride.
Why riders pick this
- 10.5:1 compression ratio for a performance boost
- Forged high-silicon aluminum construction
- Precision diamond-turned finish
- Works with all common cylinder bore types
- Improved heat transfer and reduced weight
For Sportster riders seeking a performance edge, this Wiseco piston kit provides a solid foundation. The 10.5:1 compression ratio is a popular choice for increasing engine efficiency and power output, offering a noticeable improvement over stock. Each piston is a product of advanced manufacturing, featuring a precision-machined diamond-turned finish that ensures optimal fitment and sealing within your cylinders.
Advanced Design for Peak Performance
- High-silicon, low-expansion aluminum forging for exceptional strength
- Diamond-turned finish from CNC machining for precise cylinder fit
- Compatible with cast iron, chrome, nikasil, and boron composite cylinder bores
- Reduced weight with improved heat transfer for enhanced durability
- Oversize availability for cylinder re-sleeving applications
Build a Better Sportster Engine
Whether you're rebuilding an engine or pushing for more power, these Wiseco pistons are designed to perform. Their robust construction and compatibility with various cylinder types make them a versatile choice for a wide range of Sportster builds. Always confirm your specific model year and cylinder bore size, and plan for a professional dyno tune to get the most out of your new pistons.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1748
- Compression Ratio: 10.5:1
- Application: 1200cc Sportster
- Weight: 2.5836 lbs
Common questions
What compression ratio does this kit provide?
This kit offers a 10.5:1 compression ratio, suitable for stock and moderately modified 1200 Sportster builds.
Can I use these pistons in different cylinder types?
Yes, Wiseco pistons are designed to work seamlessly in cast iron, chrome, nikasil, and boron composite cylinder bores without modification.
Do I need to resize my cylinders for this installation?
It depends on the condition of your cylinders. If they are worn beyond spec, boring and using oversize pistons may be necessary. Always measure your cylinders accurately.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Wiseco |
| TYPE | Piston kits & Components |
| SKU | K1748 |
| WEIGHT | 2.58 lb |
| 10.5 | 1 Compression |
