Harley Sportster Open Primary Kit: Performance & Style
Are you looking to seriously upgrade your Harley Sportster? One mod that can dramatically change both the performance and the look of your bike is installing an open primary kit. Guys, this isn't just about aesthetics; it’s about boosting performance and making a statement. Let's dive deep into what an open primary kit is, why you might want one, and what to consider before taking the plunge.
What is an Open Primary Kit?
So, what exactly is an open primary kit? In a nutshell, it replaces the stock, enclosed primary drive system with one that is, well, open. The primary drive is the system that transfers power from your engine to the transmission. Stock systems are typically enclosed in a protective cover, filled with oil for lubrication and cooling. An open primary kit removes this cover, exposing the belt or chain, pulleys or sprockets, and clutch assembly to the world.
The Allure of the Open Design
The appeal is multifaceted. First, there's the visual aspect. An open primary is undeniably cool. It gives your Sportster a raw, aggressive, and custom look that’s hard to ignore. You get to see the mechanical heart of your bike in action – the spinning belt or chain, the gleaming metal, all working in perfect harmony (or glorious chaos, depending on how you look at it!). This visual upgrade alone is enough for many riders to make the switch.
Beyond the aesthetics, an open primary can offer performance benefits. By reducing the amount of drag on the system, it can free up horsepower. The enclosed stock primary runs in oil, which creates friction and saps a bit of power. An open primary eliminates this, allowing the engine to spin more freely. While the horsepower gains might not be massive, they are noticeable, especially when combined with other performance modifications.
Types of Open Primary Kits
Open primary kits aren't one-size-fits-all. You'll find variations in belt width, pulley/sprocket design, and materials used. Belt drives are the most common, offering a good balance of strength, durability, and relatively quiet operation. Chain drives are also available, offering a more aggressive look and feel, but they tend to be louder and require more maintenance. The width of the belt is another factor to consider. Wider belts can handle more horsepower and are generally more durable, but they also add more bulk and can affect cornering clearance.
Why Choose an Open Primary Kit for Your Sportster?
Okay, let's break down the specific reasons why you might want to ditch the stock setup and go with an open primary kit on your Harley Sportster. There's more to it than just looking badass (though that's definitely a big part of it!).
Enhanced Aesthetics
Let’s face it: Sportsters are cool bikes, but sometimes they need a little extra something to stand out from the crowd. An open primary instantly transforms the look of your bike, giving it that custom, stripped-down, hot-rod vibe. It’s a real head-turner. The exposed mechanics add a layer of visual interest that a stock, covered primary simply can’t match. You're showcasing the inner workings of your machine, turning functional components into a design statement. Plus, the gleam of polished metal and the motion of the belt or chain are just plain mesmerizing.
Performance Gains
While it's not going to turn your Sportster into a fire-breathing monster, an open primary can contribute to noticeable performance gains. As mentioned earlier, eliminating the oil bath reduces drag on the primary drive. This allows the engine to spin more freely, translating to a slight increase in horsepower and improved throttle response. The difference might be subtle, but experienced riders often report a more connected feel to the bike. Every little bit helps, right? Especially when you're trying to squeeze every ounce of performance out of your Sportster.
Weight Reduction
Believe it or not, swapping to an open primary can also shave off a few pounds from your bike. The stock primary cover and oil add weight. While the weight savings might not be dramatic, every pound counts when you're trying to improve handling and acceleration. This is especially true for Sportsters, which are known for their nimble handling. Reducing weight further enhances this characteristic, making your bike even more responsive and fun to ride.
Easier Maintenance
This might seem counterintuitive, but in some ways, an open primary can make maintenance easier. With the primary components exposed, it’s much easier to inspect the belt or chain, pulleys or sprockets, and clutch. You can quickly identify any signs of wear or damage and address them before they become major problems. Adjusting the clutch is also typically easier with an open primary. However, keep in mind that open primaries do require more frequent cleaning to remove road grime and debris.
Considerations Before Installing an Open Primary Kit
Before you rush out and buy an open primary kit, it's crucial to consider a few things. This isn't a mod you should jump into without doing your homework. Let’s look at the key factors to keep in mind.
Cost
Open primary kits can be expensive. The cost varies depending on the brand, quality, and features of the kit. Be prepared to spend a significant amount of money, not just on the kit itself but also on installation if you're not comfortable doing it yourself. Don't cheap out on this. A high-quality kit will last longer and perform better. Factor in the cost of any additional parts you might need, such as a new clutch cable or extended shifter shaft. Remember, you get what you pay for.
Installation Complexity
Installing an open primary kit can be challenging, especially if you're not an experienced mechanic. It involves removing the stock primary drive, installing new pulleys or sprockets, aligning the belt or chain, and adjusting the clutch. If you're not confident in your mechanical abilities, it's best to have a professional install it. Improper installation can lead to serious problems, including premature wear, belt or chain failure, and even damage to your engine. Don't risk it if you're not sure.
Maintenance Requirements
While open primaries can make some maintenance tasks easier, they also require more frequent cleaning and inspection. Because the components are exposed to the elements, they're more susceptible to dirt, grime, and debris. You'll need to regularly clean the belt or chain and pulleys or sprockets to prevent wear and ensure proper operation. You'll also need to inspect the belt or chain for signs of damage and adjust the tension as needed. Be prepared to spend a little extra time keeping your open primary in top condition.
Safety Concerns
It's important to be aware of the safety concerns associated with open primaries. Because the belt or chain and pulleys or sprockets are exposed, there's a risk of getting clothing or body parts caught in the moving parts. Always exercise caution when working around the open primary, and never wear loose clothing that could get snagged. Some riders also choose to install a small guard or screen to provide an extra layer of protection. Safety first, always.
Compatibility
Make sure the open primary kit you choose is compatible with your specific Sportster model and year. Not all kits are created equal, and some are designed to fit only certain bikes. Check the manufacturer's specifications carefully before you buy. It's also a good idea to consult with a knowledgeable mechanic to ensure that the kit is a good match for your bike and riding style. The last thing you want is to end up with a kit that doesn't fit or doesn't perform as expected.
Choosing the Right Open Primary Kit
Okay, so you've decided an open primary kit is right for you. Now comes the fun part: choosing the right one! With so many options on the market, it can be overwhelming. Here’s a breakdown of what to look for to ensure you get a kit that performs well and looks great.
Brand Reputation
Stick with reputable brands that have a proven track record of producing high-quality open primary kits. Do your research and read reviews from other riders. A well-known brand is more likely to offer good customer support and stand behind their products. Some popular brands in the open primary market include BDL (Belt Drives Ltd.), Rivera Primo, and Baker Drivetrain. While they might be a bit more expensive, the peace of mind and reliability are worth the investment.
Material Quality
Pay close attention to the materials used in the kit. The pulleys or sprockets should be made from high-strength steel or aluminum. The belt should be made from durable materials that can withstand the rigors of daily riding. Avoid kits that use cheap or inferior materials, as they're more likely to fail prematurely. Look for kits that are CNC-machined for precise fit and finish. The better the materials, the longer the kit will last and the better it will perform.
Belt or Chain Type
Decide whether you prefer a belt or chain drive. Belt drives are generally quieter, smoother, and require less maintenance. Chain drives offer a more aggressive look and feel, but they're also louder and require more frequent lubrication and adjustment. Consider your riding style and personal preferences when making this decision. If you're primarily concerned with performance, a chain drive might be the way to go. If you value quiet and low maintenance, a belt drive is a better choice.
Belt Width
The width of the belt is another important factor to consider. Wider belts can handle more horsepower and are generally more durable. However, they also add more bulk and can affect cornering clearance. If you're running a high-performance engine, you'll need a wider belt to handle the extra power. If you're primarily concerned with aesthetics and handling, a narrower belt might be a better choice.
Included Components
Check to see what components are included in the kit. A complete kit should include everything you need for installation, including the pulleys or sprockets, belt or chain, clutch basket, and any necessary hardware. Some kits also include a new clutch cable or extended shifter shaft. Make sure you have everything you need before you start the installation process. It's frustrating to get halfway through a project and realize you're missing a crucial part.
Installation Tips
So, you've got your open primary kit, and you're ready to install it. Whether you're tackling this yourself or having a professional do it, here are a few key tips to keep in mind to ensure a smooth and successful installation.
Read the Instructions Carefully
This might seem obvious, but it's crucial to read the instructions carefully before you start. Familiarize yourself with the installation process and make sure you understand each step. Don't assume anything. If you're not sure about something, consult with a knowledgeable mechanic. The instructions are your roadmap to a successful installation.
Use the Right Tools
Make sure you have the right tools for the job. This includes a torque wrench, socket set, Allen wrench set, and any specialized tools that are required for your specific kit. Using the wrong tools can damage the components or make the installation more difficult. Invest in quality tools that will last. They'll pay for themselves in the long run.
Torque to Spec
Torque all fasteners to the manufacturer's specifications. This is crucial for ensuring that the components are properly secured and that the primary drive operates smoothly. Using a torque wrench is essential for this step. Over-tightening can damage the threads, while under-tightening can cause the fasteners to loosen over time.
Align the Primary Drive
Proper alignment of the primary drive is essential for preventing premature wear and ensuring smooth operation. Use a straight edge or laser alignment tool to ensure that the pulleys or sprockets are properly aligned. Misalignment can cause the belt or chain to rub against the edges of the pulleys or sprockets, leading to premature wear and failure.
Adjust the Clutch Properly
Adjust the clutch according to the manufacturer's specifications. This is crucial for ensuring smooth shifting and preventing clutch slippage. Improper clutch adjustment can lead to poor performance and even damage to the clutch. Consult the instructions or a knowledgeable mechanic for assistance with this step.
Maintaining Your Open Primary Kit
Once your open primary kit is installed, proper maintenance is key to keeping it running smoothly and looking great for years to come. Here's what you need to do to keep your open primary in top condition.
Regular Cleaning
Clean your open primary regularly to remove dirt, grime, and debris. Use a soft brush and a mild detergent to clean the belt or chain and pulleys or sprockets. Avoid using harsh chemicals or abrasive cleaners, as they can damage the components. Regular cleaning will prevent buildup and ensure smooth operation.
Inspect for Wear
Inspect the belt or chain and pulleys or sprockets regularly for signs of wear or damage. Look for cracks, fraying, or missing teeth. Replace any worn or damaged components immediately. Early detection can prevent more serious problems down the road.
Adjust Belt or Chain Tension
Adjust the belt or chain tension as needed. Proper tension is crucial for preventing premature wear and ensuring smooth operation. Consult the manufacturer's specifications for the correct tension. Too much tension can cause the belt or chain to stretch or break, while too little tension can cause it to slip.
Lubricate the Chain (If Applicable)
If you have a chain drive, lubricate the chain regularly with a high-quality chain lubricant. This will prevent rust and corrosion and ensure smooth operation. Apply the lubricant evenly to the entire chain, and wipe off any excess.
Check Fasteners
Check all fasteners regularly to ensure they're properly tightened. Loose fasteners can cause vibration and damage to the components. Torque the fasteners to the manufacturer's specifications.
By following these maintenance tips, you can keep your Harley Sportster open primary kit running smoothly and looking great for years to come. It's an investment in both the performance and the aesthetics of your bike, so take care of it!
An open primary kit is a fantastic upgrade for any Harley Sportster enthusiast looking to boost performance and add a custom look. Just remember to do your research, choose the right kit, and maintain it properly. Ride safe, guys!
