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.
Inject new life into your 1200 Sportster engine with this Wiseco forged piston kit, engineered for a robust 10.5:1 compression ratio. These pistons are meticulously crafted from high-silicon aluminum, providing an optimal balance of strength and superior heat transfer. The result is a more responsive and durable V-twin powerplant.
Why riders pick this
- 10.5:1 compression ratio for significant power gains
- Forged high-silicon aluminum for extreme durability
- Precision diamond-turned finish
- Works with all common cylinder bore types
- Reduced weight improves engine response
When upgrading your 1200 Sportster, a high-quality piston kit is paramount, and this Wiseco offering delivers. With a 10.5:1 compression ratio, you'll experience improved throttle response and a noticeable bump in overall engine output. Each piston features a diamond-turned finish from CNC machining, ensuring zero size variation and a perfect fit within your cylinder bores, regardless of their material.
Uncompromising Strength and Precision
- High-silicon, low-expansion aluminum forged construction
- Diamond-turned finish from CNC machining for exact fit
- Compatible with cast iron, chrome, nikasil, and boron composite cylinder bores
- Superior strength and reduced weight compared to cast pistons
- Improved heat dissipation for longer engine life
Reliability for High-Performance Builds
These Wiseco pistons are designed for riders who demand more from their Sportster. Their ability to handle various cylinder types and precise manufacturing make them a go-to choice for performance engine builds. Ensure you consult with a professional tuner after installation to optimize your engine's performance and longevity with the increased compression.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1747
- Compression Ratio: 10.5:1
- Application: 1200 Sportster
- Length: 9.6 in
- Width: 4.9 in
- Height: 4.1 in
- Weight: 2.4 lbs
Common questions
Will these pistons fit my 883 Sportster?
No, this specific kit is designed for 1200 Sportster engines. 883 models require a different piston kit due to bore and stroke differences.
Can I use these in a nikasil-plated cylinder?
Yes, Wiseco pistons are compatible with nikasil, chrome, boron composite, and cast-iron cylinder bores.
Do these pistons require a specific break-in procedure?
Yes, all new piston installations require a careful break-in period. Follow your engine builder's recommendations or a reputable break-in procedure for optimal ring seating and piston life.
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 | K1747 |
| WEIGHT | 2.4 lb |
| 10.5 | 1 Compression |
