Stage 1 Upgrade Explained

A Stage 1 Upgrade involves modifying a Harley-Davidson’s exhaust system, air filter and fuel metering system to allow it to increase available power, breathe more efficiently and allowing it to run as efficiently as possible.

When the air filter is free-flowing and has a match-tuned exhaust, the performance from the bike greatly increased. This is thanks to moving more air and fuel through the engine to generate more torque and power. Additionally, Stage 1 Free Flow and Heavy Breather Air Filters deliver a sweet sounding exhaust system, as well as a big boost that you can feel with an extensive RPM range.

Stage 1 Upgrade usually consists of recalibrating the air intake and exhausts systems together to improve the air flow by using specialist aftermarket accessories that are designed to improve performance. A Stage 1 Upgrade does not involve the internal engine modification of a Harley-Davidson.

Alternative Stage ¼ and Stage ½ Upgrades are also available but are seen by many as a poor alternative to the full Stage 1 Upgrade. They are a cheaper substitute to a full Stage 1 Upgrade but do not provide the performance increases that many riders desire. The addition of drilled holes in the plastic air-filter plate work by restricting air to the air filter instead of getting air via the air filter to the engine.

Harley-Davidson Stage 1 Personalisation

There is a wide range of choice when it comes to a Harley-Davidson Stage 1 Upgrade. For the full range of Stage 1 Upgrade options call our Leeds (0113 245 2499) or Gateshead (0191 461 9100) servicing teams. Alternatively, view our selection of exhaust systems and air filters below.

Screamin Eagle Ventilator - with chrome cover

Screamin' Eagle Extreme Billet

Screamin' Eagle Ventilator

V&H Short Shots

Jekill & Hyde Twin Cam Chrome

Jekill & Hyde Black Spotrster 

How much does a Harley-Davidson Stage 1 Upgrade cost?

Due to the various options that are available when it comes to a Harley-Davidson Stage 1 Upgrade prices vary. It starts at around £700 and increases to over £2000 at the top end. For more information, or to discuss your individual requirements, call the Leeds (0113 245 2499) or Gateshead (0191 461 9100) servicing teams.

Stage 2 Upgrade Explained

Take a Screamin' Eagle Stage I equipped Harley-Davidson Milwaukee-Eight engine to the next level with a Screamin' Eagle Milwaukee-Eight Stage II Kit from Harley-Davidson® Genuine Motor Parts & Accessories. Screamin' Eagle air filter, Street Cannon mufflers and Screamin' Eagle Pro Street Tuner - lays the performance foundation. Screamin' Eagle Stage II adds a performance camshaft to achieve the next step up in performance. Harley-Davidson® Genuine Motor Parts & Accessories offers two Stage II camshaft choices to tailor Milwaukee-Eight performance to specific needs.

The Screamin' Eagle Milwaukee-Eight Stage II - Torque Kit features a Screamin' Eagle torque camshaft that delivers on-demand throttle response from low to mid RPM at cruising speed. Installed in the Milwaukee-Eight, this cam produces a 5 percent increase in torque over the stock engine that can be felt immediately off the line and continues to build up to 14 percent more torque at 4500 RPM, an ideal power band for passing slow-moving vehicles without a downshift and compensating for the weight of a passenger and luggage. Kit components include a Screamin' Eagle SE8-447 cam, adjustable pushrods, pushrod covers, O-rings, and a cam cover gasket.

Riders will get an adrenaline-pumping burst of speed from the Milwaukee-Eight engine by installing the Screamin' Eagle Milwaukee-Eight Stage II – Power Kit with a Screamin' Eagle power camshaft that starts to pile on power at 3000 RPM and continues to build by up to 24 percent more power than the stock engine at redline. This kit is ideal for riders who want to ride the bike aggressively while downshifting to lower gears to keep the engine operating in the higher RPM range. Kit components include a Screamin' Eagle SE8-462 cam, adjustable pushrods, pushrod covers, O-rings, and a cam cover gasket.



Custom Harley-Davidson® Parts for Stage II upgrade

Harely-Davidson® offer two choices for customising your upgraded Stage II Milwakuee Eight engine. Your choice of pushrods finished in chrome or black.

S.K Motorcycles Ltd (trading as Harley-Davidson Gateshead & Harley-Davidson Leeds) are directly authorised and regulated by the Financial Conduct Authority. Our Firm Reference Number is FRN821369. Finance is available subject to status. S K Motorcycles Limited is authorised as a CREDIT BROKER and NOT A LENDER. This means we work with a number of carefully selected credit providers who may be able to offer you finance for your purchase, we may receive a fee for arranging credit.

Harley-Davidson Gateshead, Eslington Park, Ellison Rd, Gateshead NE8 2QU, Harley-Davidson Leeds, Unit 1, Wellington Road Industrial Estate, Wellington Rd, Leeds LS12 2UA