The Bomber DJ suspension fork from Marzocchi has earned a strong reputation in the world of mountain biking for its durability, performance, and design. Ideal for aggressive trail riders and dirt jumpers, this fork delivers excellent control and shock absorption, making it a popular choice for riders who demand precision and toughness. In this guide, we’ll explore the installation, maintenance, troubleshooting, customization, and compatibility of the Bomber DJ, while also comparing it to similar forks on the market.

Installation of the Bomber DJ Suspension Fork

Proper installation of the Bomber DJ is essential for optimal performance and rider safety. The fork comes equipped with a variety of features, such as adjustable air pressure and damping, that require careful setup. Follow these steps to install your Marzocchi Bomber DJ fork:

Tools Required

• 5mm Allen wrench [paid link]
• 6mm Allen wrench [paid link]
• Torque wrench [paid link]
• 15mm or 20mm through-axle
• Suspension grease
• Steerer tube cutter (if necessary)
• Fork-specific lower leg oil (if performing a full service)

Step-by-Step Installation

1. Prepare the Fork: Before installing the Bomber DJ, ensure the fork is properly greased. Apply suspension grease to the steerer tube, fork crowns, and the upper legs to prevent friction and ensure smooth travel.
2. Remove the Old Fork: If replacing an old fork, remove it from the bike by loosening the headset bolts and unscrewing the stem from the handlebars. Take care not to damage the headset or bearings.
3. Install the Fork: Slide the Bomber DJ fork into the headset and align it with the frame. Ensure the steerer tube is at the correct length—trim it if necessary, using a steerer tube cutter.
4. Secure the Fork: Tighten the headset and stem bolts to the manufacturer-recommended torque settings. A torque wrench [paid link] is crucial here to avoid over-tightening, which could cause damage to the fork or the frame.
5. Attach the Wheel: Insert the appropriate through-axle into the fork and wheel hub. Tighten it securely, ensuring the wheel is properly aligned and the axle is correctly seated.
6. Test the Suspension: Before riding, check the suspension fork’s travel and compression settings to ensure they match your riding style. Adjust the air pressure as needed, which we will cover in the next section.

Adjusting the Bomber DJ Fork for Optimal Performance

The Bomber DJ fork provides several options for adjustment, allowing riders to fine-tune their suspension for maximum performance based on their riding preferences and trail conditions.

Air Pressure Adjustment

The Bomber DJ features an air spring system, which allows for customizable air pressure. Correct air pressure is essential for achieving the right amount of rebound, compression, and sag.

• Start by setting the air pressure based on your weight and riding style, using the recommended guidelines from Marzocchi.
• If you feel too much compression or an overly stiff fork, reduce the air pressure in small increments.
• Conversely, if the fork feels too soft and bottoms out too easily, increase the air pressure by small increments.

Compression and Rebound Settings

In addition to air pressure, the Bomber DJ features adjustable compression and rebound damping, which can be set depending on your personal preference:

• Compression: The compression adjustment controls how the fork responds when it hits obstacles. A stiffer compression is ideal for riders who like a firmer, more responsive fork, while a softer setting provides better shock absorption on rough terrain.
• Rebound: Adjusting the rebound control ensures that the fork returns to its normal position smoothly after compression. A slower rebound is best for rough, rocky terrain, while a faster rebound works for smoother trails and jumps.

Lockout Function

The Bomber DJ also features a lockout mechanism, allowing riders to completely stiffen the fork for smoother sections of trail or climbing. This setting ensures that the suspension doesn’t absorb energy while pedaling, providing better power transfer to the wheels.

Maintenance of the Bomber DJ Fork

To keep the Bomber DJ fork performing at its best, regular maintenance is crucial. The fork is designed for heavy-duty use, but like any high-performance suspension component, it requires care to maintain its reliability.

Regular Cleaning and Lubrication

• Clean the Fork: After each ride, especially in muddy or dusty conditions, wipe down the fork’s stanchions and lower legs to remove dirt and debris. This helps maintain smooth movement and reduces wear on the seals.
• Lubricate the Seals: Apply suspension-specific lubricant to the stanchions regularly to prevent dirt from building up in the seals. This will ensure that the fork operates smoothly and prevents damage to internal components.

Oil Changes and Service Intervals

The Bomber DJ requires periodic oil changes, particularly after extensive use or heavy rides. Typically, the lower leg oil should be changed every 50-100 hours of riding. This service helps to maintain damping performance and fork longevity.

• Remove the lower legs and drain the oil, replacing it with fresh fork oil. Ensure that the oil level is correct based on the model specifications to prevent the fork from performing suboptimally.

Seals and Bushings

• Inspect the fork’s seals and bushings regularly for wear and tear. If you notice any leaking oil or rough fork movement, it may be time to replace the seals or bushings. This is a critical step in preventing further damage to the internal components.

Troubleshooting Common Issues with the Bomber DJ Fork

While the Bomber DJ fork is designed to be reliable, certain issues can arise. Below are some common problems and their solutions.

Fork Not Compressing or Bottoming Out

• Potential Causes: Incorrect air pressure, damaged air spring, or inadequate compression settings.
• Solutions: Check and adjust the air pressure. If the fork still doesn’t compress correctly, the air spring may need to be serviced or replaced.

Fork Feeling Too Soft or Too Stiff

• Potential Causes: Incorrect air pressure, rebound or compression settings.
• Solutions: Re-adjust the air pressure, compression, or rebound settings to match your riding style. It’s crucial to balance these settings for the best performance.

Leaking Oil

• Potential Causes: Worn or damaged seals, improper lubrication.
• Solutions: Inspect the seals for any visible damage. If necessary, replace the seals and re-lubricate the fork. If the problem persists, the fork may require a more thorough service.

Customization for Improved Performance

To optimize the performance of the Bomber DJ, several customization options can be explored. Riders can adjust air pressure, damping, and rebound settings based on their preferred riding style. Additionally, swapping out the stock components, such as the axle or the headset, can further enhance performance.

• Upgrading the Axle: A higher-quality, stiffer axle can improve wheel stability and alignment, especially when performing aggressive maneuvers.
• Changing the Spring Type: Some riders prefer to swap to a coil spring for better consistent performance and less fluctuation in air pressure during rides.

Comparison with Similar Forks

The Bomber DJ stands out in its category for dirt jumping and aggressive trail riding. It is often compared to other dirt jump forks like the RockShox Argyle or the Fox 36. While the Bomber DJ is known for its sturdy, heavy-duty build and excellent damping performance, the Fox 36 offers slightly better overall weight and smoother rebound for downhill rides.

The Bomber DJ is a solid, reliable choice for riders who prioritize durability and customization over weight. It’s a workhorse suspension fork that can handle even the roughest jumps and trails.

Compatibility with Other Drivetrain Components

The Bomber DJ fork is compatible with a wide range of bike frames and drivetrain components. However, due to its specific axle and headtube requirements, always verify the compatibility with your bike’s front end. The 15mm or 20mm through-axle options provide added stability, but it’s essential to ensure that your frame supports the correct axle type.

When upgrading your bike’s drivetrain or headset, make sure the components can handle the performance of the Bomber DJ fork, especially if you are looking for a more aggressive riding style or plan to use the fork for dirt jumping.