Wiseco 1200 EVO 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.
Boost the power and durability of your 1200 EVO Sportster engine with this Wiseco forged piston kit. Designed for a 10.5:1 compression ratio, these pistons offer a significant performance upgrade over stock. Crafted from high-silicon aluminum, they provide exceptional strength and superior heat dissipation for demanding V-twin applications.
Why riders pick this
- 10.5:1 compression ratio for increased power
- Forged high-silicon aluminum construction
- Precision diamond-turned finish
- Fits all common cylinder bore types
- Oversize options available for re-sleeved cylinders
This Wiseco piston kit is engineered to revitalize your 1200 EVO Sportster, delivering a robust 10.5:1 compression ratio for improved throttle response and torque. Each piston is precision-forged from high-silicon aluminum, a material chosen for its optimal blend of strength, reduced weight, and excellent thermal properties. This ensures your engine runs cooler and lasts longer, even under aggressive riding conditions.
Precision Engineering for Enhanced Performance
- Forged high-silicon, low-expansion aluminum for maximum durability
- Diamond-turned finish via CNC for consistent, zero-variation sizing
- Compatible with cast iron, chrome, nikasil, and boron composite cylinder bores
- Wide range of oversize options available for re-sleeved cylinders
- State-of-the-art forged construction for superior reliability
Upgrade Your Sportster's Core
Whether you're performing a routine rebuild or chasing more power, these Wiseco pistons are a critical component for a stronger engine. Their precise manufacturing tolerances ensure a perfect fit, contributing to a smoother running and more powerful V-twin. Combine with an exhaust and air cleaner upgrade for a complete Stage 1 or Stage 2 setup.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1687
- Application: 1200cc EVO Sportster
- Compression Ratio: 10.5:1
- Weight: 2.8387 lbs
Common questions
What compression ratio will this kit provide?
This kit is designed to deliver a 10.5:1 compression ratio, offering a balanced performance boost for your 1200 EVO Sportster.
Will these pistons work in rebored or sleeved cylinders?
Yes, Wiseco pistons are compatible with various cylinder bore types, and oversize options are available for rebored or sleeved cylinders.
Do I need to tune my bike after installing these pistons?
Any change to engine compression or displacement will require a proper dyno tune to ensure optimal performance and prevent engine damage.
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 | K1687 |
| WEIGHT | 2.84 lb |
| 10.5 | 1 Compression |
