Unlocking the Mystery: Converting a Shaft Drive Motorcycle to Chain Drive

Motorcycle Conversion: Understanding the Shaft Drive to Chain Drive Switch

If you’re a motorcycle enthusiast, you might have wondered about the feasibility of converting a shaft drive motorcycle to a chain drive. Whether you’re looking to improve the performance, reduce weight, or simply embrace the classic aesthetics of a chain-driven bike, making this change can be a rewarding yet challenging process. In this comprehensive guide, we will explore the reasons behind converting a motorcycle from shaft drive to chain drive, step-by-step instructions for the conversion, common troubleshooting tips, and the tools you’ll need. By the end of this article, you’ll have a solid understanding of how to unlock the mystery of this motorcycle transformation.

Why Consider Converting a Motorcycle from Shaft Drive to Chain Drive?

Before we dive into the technical aspects of the conversion process, it’s important to understand why you might want to make this switch in the first place. The decision to convert a shaft-driven motorcycle to chain drive often depends on various factors, including performance preferences, maintenance concerns, and the desire for a different riding experience. Here are some key reasons why motorcyclists opt for this conversion:

• Weight Reduction: Shaft drive systems tend to be heavier due to the enclosed gears and the additional components. A chain drive system is typically lighter, which can enhance the motorcycle’s overall performance.
• More Power to the Ground: Chain drives are more efficient at transferring engine power to the rear wheel compared to shaft drives, meaning you can experience better acceleration and performance.
• Customization: Chain drives offer more flexibility when it comes to customizing gear ratios for specific performance needs, whether for faster acceleration or higher top speeds.
• Ease of Maintenance: While chains do require regular maintenance, chain drive systems are easier and cheaper to repair or replace than shaft drives, which require specialized parts and work.
• Classic Aesthetic: Some riders simply prefer the look and feel of a chain-driven motorcycle, which adds a nostalgic or traditional touch to their ride.

How to Convert a Shaft Drive Motorcycle to Chain Drive

Converting a motorcycle from shaft drive to chain drive is a complex process that involves several mechanical steps and requires a good understanding of motorcycle engineering. It is not a beginner project and should only be attempted by experienced riders or professionals with the right tools. Below is a detailed, step-by-step guide on how to successfully complete this conversion.

Step 1: Assess Compatibility

Before you start the conversion process, you must evaluate if your motorcycle is even a good candidate for the swap. Some motorcycles are designed with shaft drive systems as an integral part of their frame and rear suspension design. In such cases, converting to a chain drive may not be feasible without extensive modifications.

• Frame and Swingarm: Ensure your motorcycle’s frame and swingarm can accommodate a chain and sprocket setup. Shaft-driven motorcycles may have specific geometry that doesn’t allow easy mounting of a rear sprocket and chain assembly.
• Rear Hub and Final Drive Ratio: Check if the rear hub has provisions for a sprocket. Some motorcycles will need an aftermarket or custom hub to fit the new chain system.
• Rear Wheel Alignment: The alignment of the rear wheel in a shaft-driven bike is different from chain-driven models. You may need to make modifications to the wheel’s position to maintain proper chain tension.

Step 2: Gather the Necessary Parts

To complete the conversion, you will need a variety of parts, including some that are specific to the make and model of your motorcycle. Here’s a list of components you may need:

• Rear sprocket: Choose a sprocket that matches the final drive ratio you want. This sprocket will need to be mounted onto the rear wheel.
• Chain: Select a high-quality motorcycle chain suitable for your bike’s power output and intended use.
• Chain sprockets (front and rear): The front sprocket must fit your bike’s engine output shaft, while the rear sprocket must match the wheel hub.
• Chain adjusters: You will need a mechanism to adjust chain tension. This part is often found on chain-driven motorcycles, but you may need to install or adapt adjusters to your bike.
• Custom bracket or adapter: Some motorcycles will need a custom bracket or adapter to mount the rear sprocket properly.
• Miscellaneous hardware: Bolts, spacers, and possibly a new rear wheel depending on the current setup.

Remember to consult your motorcycle’s manual or a professional mechanic to ensure compatibility between the parts and your bike’s specifications.

Step 3: Remove the Shaft Drive System

With all the parts ready, the next step is to remove the existing shaft drive system. This involves removing the rear wheel, rear swingarm, and the driveshaft assembly. Depending on your motorcycle, the exact process will vary, but here’s a general approach:

• Lift the motorcycle securely using a jack or lift stand.
• Remove the rear wheel by unscrewing the bolts that hold it in place.
• Take out the swingarm. You may need to disconnect the rear suspension components to access and remove the swingarm.
• Remove the driveshaft by detaching it from both the rear wheel hub and the output shaft of the engine. You might need to unbolt the universal joints or other connecting components.

Make sure to keep all parts, bolts, and fasteners safely organized for reassembly or future use. Once the shaft system is removed, you should have access to the area where the new chain drive components will be installed.

Step 4: Install the Chain Drive Components

With the shaft drive removed, it’s time to install the new chain drive system. This process will vary depending on the specific parts you’ve chosen, but generally follows this sequence:

• Install the rear sprocket: Mount the rear sprocket onto the rear wheel hub. You may need a custom adapter or bracket if your motorcycle doesn’t have provisions for a sprocket.
• Install the front sprocket: Remove the old driveshaft and install the new front sprocket onto the engine output shaft. Ensure it is properly secured and aligned.
• Fit the chain: With both sprockets in place, fit the chain over both sprockets. You may need to adjust the length of the chain by adding or removing links, depending on the size of the sprockets you’ve chosen.
• Adjust the chain tension: Use the chain adjusters to ensure the chain is tight enough to avoid slack but not so tight that it causes excessive wear on the sprockets.

Step 5: Reassemble and Test

Once the chain drive components are installed, it’s time to reassemble the rest of the bike. Reinstall the swingarm, rear wheel, and any other parts that were removed during the process. Check all bolts and connections to ensure they are tight and secure.

After reassembly, conduct a test ride. Pay close attention to the chain’s tension, alignment, and any unusual noises. It’s important to adjust the chain as needed after the initial ride, as it may stretch slightly during the break-in period.

Troubleshooting Tips

Even with careful preparation and installation, some common issues may arise during or after the conversion. Here are some troubleshooting tips to help you resolve potential problems:

• Chain Slippage: If the chain slips, it could be due to incorrect tension. Recheck the chain tension and ensure it is properly adjusted. Also, inspect the sprockets for wear and replace them if necessary.
• Noise and Vibration: Excessive noise or vibration might indicate misalignment between the sprockets or an improperly installed chain. Recheck the alignment of the front and rear sprockets and make sure the chain is properly lubricated.
• Chain Wear: Chains can wear out quickly if not maintained. Regularly clean, lubricate, and adjust the chain to extend its lifespan.

Conclusion

Converting a shaft drive motorcycle to a chain drive can breathe new life into your bike, offering improved performance, customization, and an iconic look. While the process is complex and requires a solid understanding of motorcycle mechanics, it can be done with the right parts, tools, and know-how. Remember, the key to a successful conversion is careful planning, compatibility checks, and thorough installation.

Before you embark on this project, it’s always a good idea to consult with a professional mechanic or a motorcycle technician to ensure you’re making the right modifications for your specific bike. If you want to explore more about motorcycle maintenance, performance upgrades, and customization tips, be sure to check out Motorcycle.com for more articles and guides.

This article is in the category Maintenance Tips and created by MotorBikePassion Team