Thinking about upgrading your Harley to Stage 4? The Stage 4 upgrade is the highest performance upgrade available for Harley-Davidson motorcycles.
It’s designed to give you the most power and torque possible, and it’s perfect for riders who demand the absolute best performance from their bikes.
But the Stage 4 upgrade is not for the faint of heart. It’s a serious performance upgrade that requires a lot of work and expertise to install.
But if you’re willing to put in the time and effort, you’ll be rewarded with a bike that’s faster, more powerful, and more fun to ride than ever before.
One of the key components of the Stage 4 upgrade is engine displacement.
The upgrade typically involves increasing the size of your engine to 114 cubic inches or more.
This is achieved through the use of larger cylinders and pistons, as well as other performance upgrades like high-flow air filters, exhaust systems, and camshafts.
The cost of the Stage 4 upgrade varies depending on the specific components you choose and the amount of labor required to install them.
In general, you can expect to pay anywhere from $3,000 to $7,000 or more for a complete Stage 4 upgrade.
This may seem like a lot of money, but it’s important to remember that you’re getting a lot of performance for your money.
When it comes to performance upgrades, there’s no better choice than the Stage 4 upgrade for Harley-Davidson motorcycles.
It’s the ultimate performance upgrade, and it’s perfect for riders who demand the best from their bikes.
If you’re willing to invest the time and money required to install the Stage 4 upgrade, you won’t be disappointed with the results.
Components of a Stage 4 Upgrade
If you are looking to upgrade your Harley-Davidson motorcycle to increase its power, then a Stage 4 upgrade might be just what you need.
A Stage 4 upgrade is a complete package of OEM performance parts designed to give your bike a significant boost in power and performance.
Let’s look at the various components that make up a Stage 4 upgrade.
Engine and Exhaust System
The engine and exhaust system are the heart of any motorcycle, and a Stage 4 upgrade includes significant upgrades to both.
The engine is upgraded with high-performance cylinders, forged aluminum pistons, and an SE8-498 cam.
These upgrades increase the engine’s compression ratio, allowing more air to flow through the engine, resulting in enhanced combustion and increased power.
The exhaust system is also upgraded to a high-flow system, which further increases the engine’s power output.
Throttle Body and Intake Manifold
The throttle body and intake manifold are responsible for delivering both air and fuel to the engine.
In a Stage 4 upgrade, these components are upgraded to a high-flow system, allowing more air and fuel to enter the engine.
This increased airflow results in improved performance and power.
Cylinder Heads and Pistons
The cylinder heads and pistons are critical components of the engine that play a significant role in its performance.
In a Stage 4 upgrade, these components are upgraded to increase the engine’s compression ratio, and that allows more air and fuel to enter the engine.
This increased airflow results in improved performance and power.
Cam Upgrade and Valves
The camshaft and valves are responsible for controlling the engine’s airflow and combustion.
In a Stage 4 upgrade, the camshaft is upgraded to a high-performance cam, which increases the engine’s power output.
The valves are also upgraded to allow more air to flow through the engine, resulting in improved performance.
Clutch Components and Injectors
The clutch components and injectors are also upgraded in a Stage 4 upgrade.
The clutch components are upgraded to handle the increased power output of the engine, while the injectors are upgraded to provide more fuel to the engine, allowing it to produce more power.
Performance and Power Upgrade
This upgrade will bring significant improvements in power, performance, and overall riding experience.
So let’s look at the various aspects of the upgrade that contribute to its performance and power.
Torque and Horsepower
The Stage 4 upgrade is designed to provide a significant boost in torque and horsepower.
With the upgraded components, your Harley will have more power at lower RPMs, making it easier to accelerate and pass other vehicles on the road.
The increased torque will also provide a more responsive throttle, making it easier to control the bike in tight corners and other challenging situations.
Acceleration and RPM Range
The Stage 4 upgrade will also improve your Harley’s acceleration and RPM range.
The upgraded components will allow your bike to reach higher speeds more quickly, making it easier for you to merge onto highways and pass other vehicles.
Additionally, the increased RPM range will provide a smoother and more consistent power delivery, allowing you to ride at higher speeds for longer periods without experiencing any performance issues.
Compression and Redline
The Stage 4 upgrade also includes modifications to the engine’s compression and redline.
The increased compression ratio will provide more power and torque, while the higher redline will allow you to ride at higher speeds without experiencing any performance issues.
These modifications will also help to improve the overall durability and longevity of your engine, ensuring that it lasts for many years to come.
Cost of Harley Stage 4 Upgrade
If you’re considering upgrading your Harley to Stage 4, you’re probably wondering how much it’s going to cost you.
The cost of a Stage 4 upgrade can vary depending on a few factors, including the type of parts you choose and the labor cost of the mechanic you go to.
Parts and Labor Cost
The cost of parts for a Stage 4 upgrade can vary depending on the brand and type of parts you choose.
On average, you can expect to pay between $2,500 and $4,500 for the parts alone.
However, keep in mind that this is just an estimate, and the cost can vary depending on the specific parts you choose.
The labor cost of a Stage 4 upgrade can also vary depending on the mechanic you go to.
On average, you can expect to pay between $500 and $1,500 for labor. Again, this is just an estimate, and the cost can vary depending on the mechanic you choose.
Tuner and Pro Street Tuner
In addition to the cost of parts and labor, you’ll also need to purchase a tuner or Pro Street Tuner to properly tune your bike after the upgrade.
A tuner can cost between $300 and $600, while a Pro Street Tuner can cost between $500 and $1,000.
Keep in mind that a Pro Street Tuner is recommended for Stage 4 upgrades, as it allows for more precise tuning and can help maximize performance.
Overall, the cost of a Stage 4 upgrade can be quite significant, but it can also greatly improve the performance of your Harley.
It’s important to do your research and choose high-quality parts and a reputable mechanic to ensure the best results.
Aesthetic Aspects of Stage 4 Upgrade
When considering a Stage 4 upgrade for your Harley, there are a few aesthetic aspects that you should keep in mind.
These upgrades not only improve the performance of your motorcycle but also give it a unique look and sound. Here are some things to consider:
Look and Sound
One of the most noticeable changes after a Stage 4 upgrade is the sound of your motorcycle.
The upgrade typically includes high-performance exhausts, which give your bike a deep, throaty growl.
This sound is not only impressive but also lets other drivers know you are coming.
Additionally, the upgrade often includes a new air intake system, which can give your motorcycle a more aggressive look.
Feel and Response
A Stage 4 upgrade is designed to improve the feel and response of your motorcycle.
With upgraded components, your Harley will accelerate faster and have more torque. This means you will feel more power when you twist the throttle.
The upgrade also includes a new camshaft, which can give your motorcycle a smoother idle and better low-end power.
Comparing Stage 4 Kits
Stage 4 Kit and Stage IV Kit
If you’re looking to upgrade your Harley-Davidson motorcycle, you might be considering either a Stage 4 Kit or a Stage IV Kit.
While both kits are designed to increase your bike’s horsepower and torque, there are some key differences between the two.
The Stage 4 Kit is a comprehensive upgrade that includes a high-flow air cleaner, a performance exhaust system, and a remapped electronic control module (ECM).
This kit is designed to increase your bike’s power and performance across the entire RPM range.
It’s a great choice for riders who want a significant boost in power without having to make major modifications to their bike.
The Stage IV Kit, on the other hand, is the largest displacement kit available for Harley-Davidson motorcycles.
It includes patent-protected cylinder technology and is designed to deliver maximum horsepower all the way to the redline.
This kit is best suited for riders who want the ultimate in power and performance and are willing to make significant modifications to their bike.
131ci Stage IV Kit and 131 Stage IV Timer Cover
If you’re considering the Stage IV Kit, you might also be wondering about the 131ci Stage IV Kit and the 131 Stage IV Timer Cover.
Here’s what you need to know:
The 131ci Stage IV Kit is a larger displacement version of the Stage IV Kit.
It includes everything in the Stage IV Kit, plus larger cylinders and matching pistons. This kit is designed to deliver even more power and performance than the standard Stage IV Kit.
The 131 Stage IV Timer Cover is a separate upgrade that can be added to the Stage IV Kit or the 131ci Stage IV Kit.
It includes a high-capacity oil pump and cam plate, which are designed to provide better oil flow and increased durability.
This upgrade is especially important for riders who plan to use their bike for high-performance riding or racing.
Overall, the Stage 4 Kit and Stage IV Kit are both great options for riders who want to increase their bike’s power and performance.
The Stage IV Kit is the ultimate choice for riders who want the most power possible, while the Stage 4 Kit is a more comprehensive upgrade that’s easier to install and requires fewer modifications to your bike.
Additional Components
When upgrading to a Stage 4 kit, it’s important to consider additional components that may be necessary to ensure optimal performance.
Here are two components you should consider adding to your Stage 4 kit:
High Capacity Lifters and Tappets
The lifters and tappets in your engine are responsible for opening and closing the valves.
When upgrading to a Stage 4 kit, it’s recommended to install high capacity lifters and tappets.
These components are designed to handle the increased power and torque produced by the upgraded engine.
High capacity lifters and tappets will help ensure that your engine runs smoothly and reliably.
High Flow Injectors and Air Filter
To achieve maximum performance from your Stage 4 kit, it’s important to ensure that your engine is getting enough fuel and air.
High flow injectors and air filters can help achieve this goal. High flow injectors are designed to deliver more fuel to the engine, while high flow air filters allow more air to enter the engine.
These components work together to improve engine performance and ensure that your bike runs smoothly.