Improve each mile of your ride with the Stage I -IV Upgrades. No longer will you have to experience all the trial-and-error that comes with your bike’s engine modification. The powerful line-up of upgrade stages are all about performance and look and feel - engineered to generate specific torque and horsepower gains.
Please scroll down to find out more about Stages 1 - 4.
Ideal for riders that want to enhance the performance, look and sound of their motorcycle: This delivers the perfect foundation for future upgrades.
Stage 1 offers up the most cost-effective step to improve performance. Match any high-flow air cleaner and exhaust, along with the proper ECM calibration to increase the air flow into and out of the engine and you’ll feel up to a 10% increase in performance throughout the entire RPM range.
1 - Enhanced exhaust systems provide less restriction for the gases to escape, but also have the added perk of giving the bike that raw, powerful, Harley sound!
2 - Stage 1 upgrades are a widely recognised addition and will certainly add value to your bike.
3 - Not only will the conversion increase the overall BHP and provide that traditional Harley-Davidson sound, but you'll also find the response from the throttle will be crisper and sharper, and your riding experience more enjoyable overall.
The price of a Stage 1 upgrade can greatly differ, depending on which air filter and exhaust system you opt for, and can range from £800 - £2000+ for professional fitting and calibration. As there are so many different options and interpretations, pricing is unique to each bike and rider.
When it comes to the air cleaner kit and exhaust system, there is an abundance of choice to customise the look of your Harley, and most would agree that these additions make the world of difference.
Here are just a few examples of the air filters and exhaust system brands for you to choose from:
Choose a TORQUE CAM or POWER CAM based on your riding style.
OPTION 1: TORQUE KIT
Ideal for riders look for instant passing power at cruising and highway speeds. Upgrade with the torque kit and you’ll feel up to a 15% increase in performance in the low-to-mid RPM range. This option is perfect if you want to experience a crisp throttle response and acceleration that can be felt at slower speeds, great for passing slow moving vehicles without downshifting.
OPTION 2: POWER KIT
Ideal for riders who want to feel the power build and pull all the way to the redline. Feel up to a 25% increase in performance in the mid-to-upper RPM range, along with an adrenaline-pumping burst of speed.
A Stage 2 Upgrade costs £1,250 on a Milwaukee Eight Engine. For prices on alternative engines, please get in touch.
Accomplished with larger cylinders, matching pistons, and the proper cam upgrade (see Stage 2) - an increase in engine displacement allows the engine to swallow more air and fuel, a higher compression piston squeezes the air and fuel into a more volatile mixture and when combined, generates more power when ignited.
A Stage 3 Upgrade is ideal for riders who want the largest engine displacement and increased power throughout the entire RPM range, with up to a 35% increase in the mid-to-upper RPM range. The upgrade produces instant passing power without downshifting and will deliver excellent stoplight to freeway speed and on-ramp acceleration.
A Stage 3 Upgrade costs £2,750 on a Milwaukee Eight Engine. For prices on alternative engines, please get in touch.
The highest level performance upgrade available to provide a maximum increase in displacement, compression and flow. Higher-flowing CNC ported cylinder heads and larger bore throttle body increase the velocity and feed large volumes of air and fuel into the engine, which maximizes power on a larger displacement engine. As well as combining ported cylinder heads and larger throttle body in combination with cylinders, matching pistons and proper cam.
A Stage 4 Upgrade is ideal for riders who want the absolute best performance upgrade available. Expect to feel exceptional acceleration, delivering significant gains and up to a 50% increase in the higher RPM range.
A Stage 4 Upgrade costs £3,650 on a Milwaukee Eight Engine. For prices on alternative engines, please get in touch.
Talk to our parts advisors about exactly what you'd like to get out of your bike and how you want it to look and feel. We'll discuss all the different options available with you and find the perfect combination for you and your ride. Call 01622 711680 during opening hours, or follow the link below to send us a message.
Made in the USA, precision machined from billet aluminium and complete with a blue anodized finish, the Milwaukee Eight Oil Pump Upgrade allows for an increased flow capacity on both feed and scavenge side (approximately a 44% flow increase on the supply side, and 58% on the scavenge).
Offering independent scavenge sections for the flywheel and cam chest, along with debris screens in both scavenge pickups and a magnet within the cam check to assist in preventing debris from entering the pump.
An adjustable pressure relief valve can be adjusted with a unit within the engine, plus the upgrade will provide removable passage plugs for servicing purposes.