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.
Unleash the full potential of your 1200 EVO Sportster engine with this Wiseco forged piston kit. Engineered for a 10.5:1 compression ratio, these pistons deliver a noticeable boost in performance and reliability. Crafted from high-silicon aluminum, they ensure robust strength and superior heat transfer for extended engine life on the road or track.
Why riders pick this
- Forged high-silicon aluminum for extreme strength
- 10.5:1 compression ratio for a significant power boost
- Diamond-turned finish for precise cylinder fitment
- Works with cast iron, chrome, nikasil, and boron composite bores
- Enhanced heat transfer for longer piston life
When it's time to rebuild or upgrade your 1200 EVO Sportster, a Wiseco piston kit is the foundation for reliable power. This kit is designed for a 10.5:1 compression ratio, providing a solid performance improvement over stock without demanding extreme engine modifications. The precision engineering and material science behind these pistons mean they're built to withstand the demands of aggressive riding.
Engineered for Performance and Durability
- Forged high-silicon, low-expansion aluminum for superior strength
- Diamond-turned finish ensures precise bore fitment
- Compatible with all common cylinder bore types: cast iron, chrome, nikasil, and boron composite
- CNC-machined for consistent, zero-variation sizing
- Optimized for efficient heat transfer and extended piston life
A Foundation for Your Build
Whether you're refreshing a tired motor or building a performance monster, these Wiseco pistons provide a critical upgrade. Their robust construction and precise manufacturing mean a more durable and responsive engine. Consider pairing these with a performance cam and a proper dyno tune to fully realize your Sportster's power potential.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1686
- Compression Ratio: 10.5:1
- Engine: 1200cc EVO Sportster
- Weight: 3.1116 lbs
Common questions
What compression ratio do these pistons provide?
This kit delivers a 10.5:1 compression ratio, ideal for performance upgrades on 1200 EVO Sportster engines.
Are these pistons compatible with different cylinder types?
Yes, these Wiseco pistons are engineered for compatibility with cast iron, chrome, nikasil, and boron composite cylinder bores.
Do I need to re-sleeve my cylinders for this kit?
If your cylinders are worn or damaged, you may need to bore them and use an oversize piston kit. Please confirm your specific cylinder requirements before ordering.
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 | K1686 |
| WEIGHT | 3.11 lb |
| 10.5 | 1 Compression |
