2025 FXLRS Build By Geelong Harley-Davidson®
The 2025 FXLRS Harley-Davidson® Low Rider S built by Michael Webb at Geelong Harley-Davidson® is a performance-focused custom build designed to improve horsepower, torque, engine reliability and handling. Featuring a Feuling HP+ Oil System, Zippers Red Shift 552 Camshaft, Trask Assault Charge Air Cleaner and SP Concepts 2-into-1 Exhaust, the engine upgrades are supported by a Trask High Pressure Clutch Power Plate. A lightweight Trask Billet Swingarm and Thrashin Supply Triple Tree Kit complete the build, improving stability, control and ride quality. This 2025 FXLRS showcases how carefully selected aftermarket performance parts can transform a Harley-Davidson® Low Rider S.
2025 Low Rider S Performance Build
| PART | WHAT IT DOES | FITS | ALSO NEEDS |
|---|---|---|---|
| Feuling Parts HP+ Oil Pump & Cam Plate | High-volume oil pump and billet cam plate improve oil pressure, flow and scavenging for better engine protection. | 2017-up oil-cooled Milwaukee-Eight engines. Excludes 2024-up centre-cooled Touring models. | Correct fitment-specific installation components and professional installation. |
| Zippers Red Shift 552 Chain Drive Camshaft | Performance camshaft designed to deliver stronger torque and horsepower across a broad RPM range. | Performance-built Milwaukee-Eight engines with suitable compression and supporting modifications. Confirm model-specific fitment. | High-flow air cleaner, performance exhaust, suitable engine configuration and professional ECU tune. |
| Trask Assault Charge 68mm Air Cleaner Kit | High-flow filter and internal velocity stack improve airflow into the throttle body. | 2025-up Softail models fitted with the compatible 68mm Screamin' Eagle throttle body. | Compatible 68mm throttle body. ECU tuning recommended when combined with other performance upgrades. |
| SP Concepts 2-into-1 4.5in Big Bore Exhaust | Stainless-steel exhaust with stepped headers and a high-flow muffler designed to improve torque and horsepower. | 2018-up Softail models with standard rear tyre widths. Excludes 240mm rear tyre applications. | Professional ECU tune recommended, particularly with camshaft and air cleaner upgrades. |
| Trask High Pressure Clutch Spring Power Plate Kit | Increases clutch holding pressure by 50% over stock to help prevent slippage under heavy load. | 2013-up CVO, 2016-2017 S models, 2017-up M8 Touring and 2018-up M8 Softail. Check specific clutch compatibility. | Standard clutch components in serviceable condition. Optional Trask clear derby cover. |
| Trask Billet Swingarm | Billet aluminium swingarm, approximately 25% lighter than stock, with increased rigidity and up to 2in of length adjustment. | 2018-up Softail models. Confirm compatibility with model-specific components. | Professional installation and correct suspension, belt and wheel alignment. Optional custom finish. |
| Thrashin Supply Co Triple Tree Kit | Billet triple trees allow up to 1in of additional front ride height and adjustable riser positioning. | Listed for 2022-up Low Rider ST. Low Rider S fitment requires verification. Not compatible with stock Low Rider S fairing. | Reuse and transfer OEM steering stem. Professional installation and compatible front-end components. |
Feuling Parts HP+ Oil System with Oil Pump & Cam Plate
The Feuling HP+ Oil System is where this 2025 FXLRS starts to separate itself from a bolt-on stage one. Michael chose this system because the Milwaukee-Eight®’s factory oiling system, whilst adequate for stock output, starts to show its limits once you’re asking more from the engine. The HP+ addresses that with a billet 6061 aluminium high-volume oil pump and a hard-anodised 7075 billet aluminium cam plate.
Together, they increase oil pressure, volume and flow while improving return-oil scavenging, the kind of changes that don’t just protect an engine under load; they extend its working life.
This is a foundational upgrade, the kind of work a Master Technician does first, not last, because everything else you bolt onto this engine will benefit from better oiling. The HP+ fits 2017-up oil-cooled Milwaukee-Eight® models (it does NOT fit 2024-up centre-cooled Tourers, which use a water-cooled system)
Zippers Red Shift 552 Chain Drive Camshaft
Trask Assault Charge High-Flow 68mm Air Cleaner Kit
You can’t ask an engine to work harder and then starve it of air. The Trask Assault Charge Air Cleaner solves that problem with a high-capacity filter and internal velocity stack that optimise airflow into the 68mm Screaming Eagle® throttle body fitted to 2025-up Softail models such as the 2025 FXLRS. This isn’t a styling cover with a token filter behind it; the Assault Charge is dyno-tested and engineered to move serious air while maintaining a clean, OEM-like appearance.
The billet aluminium backing plate includes an integrated breather recirculation system that routes head breather pressure back into the throttle body, just like the stock setup.
That keeps the installation clean and avoids external breather venting unless you choose to run the optional Trask External Breather Kit.
SP Concepts 2-into-1 4.5in Big Bore Exhaust
The 2025 FXLRS engine needs to breath freely and an exhaust that flows to match. The SP Concepts 2-into-1 is a full stainless-steel system built around a 4.5-inch high-flow rolled-cone muffler with a stepped baffle (2.25 inch to 2.5 inch) designed to increase bottom-to-mid-range torque and horsepower across a wide displacement range.
The .065-gauge stainless headers are stepped from 1.75 inch to 1.875 inch to 2 inch at the collector, a design that accelerates exhaust gas velocity and scavenging without choking off top-end flow.
Trask High Pressure Clutch Spring Power Plate Kit
Trask Billet Swingarm
That weight reduction is unsprung mass, the kind that improves suspension response, cornering stability, and overall handling feel.
Thrashin Supply Co Triple Tree Kit
2025 FXLRS Dyno Chart Results
What makes this 2025 FXLRS stand out isn’t just the impressive list of performance parts… It’s the thought and experience behind every upgrade. Michael Webb and the team at Geelong Harley-Davidson® have put together a machine where every component serves a purpose, from improving engine reliability and extracting more horsepower to putting that power to the ground with confidence.
This 2025 FXLRS Performance Build is a perfect example of what can be achieved when quality components are paired with expert workmanship and a clear vision. The result is a seriously capable Low Rider S that performs as aggressively as it looks. Hats off to Michael and the Geelong Harley-Davidson® crew for putting together one hell of a machine!
Frequently Asked Questions:
Why upgrade the oil pump on a Milwaukee-Eight® engine?
A performance oil pump like the Feuling HP+ increases oil flow and improves scavenging on Harley-Davidson Milwaukee-Eight® engines. Better scavenging returns oil from the crankcase to the tank more efficiently, while higher flow keeps lubrication and oil pressure consistent. This matters most on modified Milwaukee-Eight® engines, where extra horsepower brings more heat and load on internal components.
Does a 2-into-1 exhaust improve performance on an FXLRS?
Yes, a well-designed 2-into-1 exhaust can increase torque and horsepower on a Harley-Davidson Low Rider S (FXLRS) by helping exhaust gases flow out of the engine more efficiently. The SP Concepts 2-into-1 system fitted to this build is designed to deliver strong bottom-end and mid-range performance, which is where the FXLRS spends most of its time on the road.
Do I need to tune my FXLRS after fitting a camshaft and exhaust?
Yes, an FXLRS needs an ECU tune after a camshaft, air cleaner and exhaust upgrade. These parts change how much air moves through the Milwaukee-Eight® engine, and the factory fuel and ignition settings aren’t set up for that. A tune matches the fuelling to the new components so the engine runs correctly and makes full use of the upgrade.
What does the Trask High Pressure Clutch Power Plate do?
The Trask High Pressure Clutch Power Plate increases clutch holding pressure by 50% over the stock Harley-Davidson clutch. The extra pressure stops the clutch slipping under hard acceleration, which is a common problem on modified Milwaukee-Eight® engines producing significantly more horsepower and torque than the factory clutch was designed to handle.
What are the benefits of fitting a billet swingarm?
A billet swingarm reduces weight and increases rigidity at the rear of the bike. The Trask Billet Swingarm fitted to this FXLRS is approximately 25% lighter than the factory steel swingarm and stiffer under load. The result is sharper suspension response, better handling and more stability, especially when the bike is ridden hard through corners.
Can the Trask Billet Swingarm be adjusted?
Yes, the Trask Billet Swingarm can be extended by up to 2 inches. Lengthening the swingarm increases the wheelbase and shifts weight distribution on the Harley-Davidson, so riders can set the bike up for more straight-line stability or keep it shorter for quicker handling, depending on their riding style.
What does the Thrashin Supply Triple Tree Kit change?
The Thrashin Supply Triple Tree Kit lets riders adjust front ride height and handlebar riser position on the Harley-Davidson FXLRS. It provides up to 1 inch of additional ground clearance and moves the risers up to 1 inch closer to the rider, improving cornering clearance and giving a more comfortable, controlled riding position.
Where can I buy the performance parts used on this FXLRS?
The Feuling, SP Concepts, Trask and Thrashin Supply parts used on this FXLRS build are available in Australia and New Zealand through Rollies Speed Shop’s authorised dealer network. Visit rolliesspeedshop.com to browse the range or order them at your local Harley-Davidson® Dealership or Performance Workshop.
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