Feuling 7255 HP+ Reaper 405 Chain Drive Camchest Kit for Water-Cooled M8 Models

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Feuling 7255 HP+ Reaper 405 Chain Drive Camchest Kit

For Water-Cooled Milwaukee-Eight (M8) Models

The Feuling 7255 HP+ Reaper 405 Chain Drive Camchest Kit provides a complete, top-to-bottom camchest solution for Harley-Davidson® water-cooled Milwaukee-Eight (M8) engines. Instead of ordering individual components, FEULING® packages every critical part under one part number. As a result, each component works together in total harmony while eliminating guesswork during the build process.

Moreover, this matched camchest system delivers maximum reliability, improved oil control, and consistent performance. Because oil management plays a critical role in engine longevity, this kit also achieves some of the coolest engine and oil temperatures available for the M8 platform. Ultimately, the result is a smoother, quieter, and more efficient engine that performs reliably in both aggressive street builds and long-distance touring applications.

Key Performance Benefits

First and foremost, this camchest kit improves overall engine operation. In addition, it increases oil pressure and scavenging efficiency throughout the engine.

• Quieter and smoother engine operation

• Increased oil pressure, scavenge volume, and engine oil flow

• 27% more pressure and scavenge gear volume compared to stock

• 42% more scavenge volume through optimized port sizing and matched passages

• 68% more oil volume delivered to the crankshaft and connecting rod bearings

• Engine temperatures reduced by 15–25°F

• Oil temperatures reduced by 15–30°F

• 10–30 PSI increase in oil pressure

• Reduced wet sumping, blow-by, and oily air cleaners

• Additionally, magnets integrated into the oil pump help protect gears and the pressure relief valve

• Dyno testing shows 2 HP and 2 ft-lbs of torque gains at the rear wheel

• Finally, FEULING testing confirms a 50% reduction in engine sump oil level

HP+® Series Components

The HP+® Series camchest kit includes premium components that are engineered to work together. Therefore, each part supports consistent oil flow, durability, and long-term reliability.

• Billet 6061 aluminum high-volume oil pump

• FEULING® High Flow camplate

• HP+® hydraulic roller lifters

• Complete cam installation kit

Reaper 405 Camshaft Performance

At the heart of this kit is the Reaper 405 camshaft. Specifically, this camshaft produces a wide and usable powerband that increases torque and horsepower across the entire RPM range when compared to stock.

Furthermore, the Reaper 405 is designed as a direct bolt-in replacement for Milwaukee-Eight engines. Because of this, it can be used with stock valve springs, pushrods, lifters, and exhaust systems.

Additionally, this camshaft responds exceptionally well to both slip-on mufflers and complete exhaust systems when paired with a high-flow air cleaner. For best low-RPM power and throttle response, FEULING recommends free-flowing mufflers with smaller cores.

Kit Includes

To ensure a complete installation, the Feuling 7255 kit includes every necessary component. As a result, no additional sourcing is required.

• FEULING® high-volume oil pump

• FEULING® High Flow billet camplate

• REAPER® Series 405 camshaft

• Hydraulic roller lifters

• Fixed-length pushrods

• TIMKEN® / KOYO® cam bearing

• Rocker arm studs and nuts

• Complete gasket and O-ring set

• ARP® cam and crank fasteners with washers

• Moly lube and LOCTITE®

Oil Level & Setup Notes (IMPORTANT)

DO NOT OVERFILL THE OIL TANK

Proper oil level is critical for correct operation. For this reason, FEULING recommends running the oil level 90–99% full when hot.

However, because the Milwaukee-Eight oil pickup port is located on the right side of the engine, allowing the bike to idle or warm up on the kickstand can fill the engine case. Consequently, this may result in an inaccurate oil level reading in the tank.

Recommended Oil Level Procedure:

1. First, check the oil level when cold

2. Next, ride the bike until operating temperature is reached

3. Then, shut the bike off while it remains upright

4. Afterward, place the bike on the kickstand and recheck oil level

5. Finally, add or remove oil as needed