S&S Cycle Hooligan 1250cc Big Bore Kit - Harley Sportster
About S&S Cycle
S&S Cycle has built American V-twin performance parts in Viola, Wisconsin since 1958 — flywheels, carburetors, cams, cylinder heads and complete crate engines. When a Harley owner talks about a 124, a 128 or a 131 build, they are usually talking about S&S. Few names carry more weight with engine builders in this space.
Transform your 1200cc Sportster into a 1250cc powerhouse with the S&S Cycle Hooligan Big Bore Kit. This bolt-on upgrade delivers a significant bump in displacement and performance without requiring complicated machining or rebalancing of your engine's internals. It's designed for riders seeking an easy path to more usable torque and horsepower from their V-twin.
Why riders pick this
- Boosts 1200cc Sportster engines to 1250cc
- Bolt-on cylinders and pistons for easy install
- Includes S&S 482 cam for improved power delivery
- Works with stock heads, pushrods, and fuel system
- Wrinkle black finish matches factory engine cases
The S&S Cycle Hooligan Big Bore Kit is engineered for a straightforward installation, allowing you to upgrade your 1200cc Sportster engine to 1250cc with minimal hassle. This kit includes new cylinders, pistons, and an S&S 482 cam, all designed to work seamlessly with your stock heads, pushrods, and fuel system. The wrinkle black finish ensures it blends in perfectly with your existing engine aesthetics.
Unlock More Sportster Performance
- Increases 1200cc Sportster engine displacement to 1250cc
- True bolt-on installation requires no machining or rebalancing
- Includes an S&S 482 cam for enhanced valve timing and power
- Designed to integrate with stock heads, pushrods, and fuel system
- Wrinkle black finish provides a factory-matched appearance
Simple Path to Power
This Hooligan kit is ideal for Sportster owners looking for a significant performance boost without the complexity of a full engine build. By utilizing existing engine components, S&S has made a big-bore upgrade accessible for the home mechanic or a quick shop install. Pair it with an S&S intake and exhaust for the full performance potential.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 910-0701
- Category: Engine Components / Piston Sets - Powersports
- Weight: 26.9 lb
Common questions
Do I need to machine the cylinders or rebalance the crank?
No, this S&S Hooligan kit is a true bolt-on upgrade. The pistons and cylinders install without machining, and your engine's internal components do not require rebalancing.
Will this kit work with my stock heads and pushrods?
Yes, this kit is specifically designed to be compatible with your stock cylinder heads, pushrods, and existing fuel system for a direct fit.
What kind of performance increase can I expect?
While specific numbers vary, this kit is designed to provide a noticeable increase in displacement and power. For optimal results, consider combining it with an S&S intake and exhaust system.
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 | S&S Cycle |
| TYPE | Piston Sets - Powersports |
| SKU | T14-664087 |
| WEIGHT | 26.9 lb |
