Rocket Performance Garage 128" Big Bore Cylinder Kit - Milwaukee-Eight 2017-2024
About Rocket Performance Garage Llc
Rocket Performance Garage builds V-twin performance and custom parts, working in the modern bagger and Softail space.
The Rocket Performance Garage 128 cubic inch big bore cylinder kit is designed for 2017-2024 Harley Milwaukee-Eight engines, upgrading them from 107cc to 128cc. This kit includes USA-made cylinders and Wiseco forged pistons, matched for reliable power gains and enhanced street rideability.
Why riders pick this
- Increases Milwaukee-Eight displacement to 128 cubic inches
- Includes premium USA-manufactured cylinders
- Wiseco forged pistons for strength and reliability
- Designed for significant power and torque gains
- Black powder-coated finish with machined fins for a factory look
When stock displacement just isn't cutting it, the Rocket Performance Garage 128" big bore cylinder kit is your answer for serious power. This kit transforms your 2017-2024 Milwaukee-Eight engine, increasing its displacement to 128 cubic inches for a dramatic boost in torque and horsepower. Crafted with precision in the USA, these cylinders are paired with high-quality Wiseco forged pistons, ensuring durability and performance that stands up to aggressive riding.
Unlock Your M8's True Potential
- Increases Milwaukee-Eight displacement to 128 cubic inches
- Includes premium USA-manufactured cylinders
- Wiseco forged pistons for strength and reliability
- Designed for significant power and torque gains
- Black powder-coated finish with machined fins for a factory look
The Foundation for a High-Performance Build
Upgrading to a big bore kit is a fundamental step in building a high-performance Milwaukee-Eight. The Rocket Performance Garage 128" kit provides the robust foundation you need for a powerful engine. Professional installation is highly recommended, as big bore cylinder installation requires meticulous engine disassembly and precise machine work to ensure optimal performance and longevity. Pair this kit with a performance cam, high-flow air cleaner, and a proper dyno tune for a complete, unstoppable package.
Specifications
- Brand: Rocket Performance Garage
- Manufacturer Part #: 8-8102
- Displacement Increase: 107cc to 128cc
- Compression Ratio: 10.5:1
- Piston Type: Wiseco forged
- Length: 9 in
- Width: 8 in
- Height: 20 in
- Weight: 25 lbs
- Country of Origin: USA
Common questions
What Milwaukee-Eight engines does this kit fit?
This Rocket Performance Garage 128" big bore kit is specifically designed for 2017-2024 Harley-Davidson Milwaukee-Eight (M8) engines.
Is professional installation required for this big bore kit?
Yes, big bore cylinder installation requires engine disassembly, precise measurements, and careful assembly. We strongly recommend having a qualified Harley technician or performance shop handle this job.
Will I need to upgrade my fuel management and cam?
Absolutely. A significant displacement increase like this kit provides will necessitate a performance cam, a high-flow air cleaner, a fuel tuner, and a custom dyno tune to ensure optimal performance, reliability, 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 | Rocket Performance Garage Llc |
| TYPE | Engine |
| SKU | 276-02060 |
| WEIGHT | 25.0 lb |
