JFG RACING Dirt Bike Rear Axle Blocks & CNC Chain Adjuster User Manual

Introduction

This manual provides essential information for the installation, operation, and maintenance of your JFG RACING Dirt Bike Rear Axle Blocks and CNC Chain Adjuster. These high-quality components are designed to enhance the performance and precision of your motorcycle's chain adjustment and wheel alignment. Please read this manual thoroughly before installation and use to ensure proper function and safety.

Product Specifications

Compatibility

These JFG RACING Rear Axle Blocks are designed for specific Yamaha dirt bike models. Please verify your motorcycle's model and year before installation.

• Yamaha YZ250F: 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022
• Yamaha YZ450F: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022

Note: While some reviews mention compatibility with other models like WR450F or YZ125, official fitment is guaranteed for the models listed above. Always confirm fitment for your specific bike.

Key Features

• Lightweight Design: Crafted from durable billet 6061-T6 aluminum, ensuring strength without adding unnecessary weight.
• Anodized Finish: Features an attractive and protective blue anodized coating.
• Clear Adjustment Marks: Equipped with easy-to-read markings for precise and accurate wheel alignment.
• Reversible Design: Allows the axle to be extended without fully running out adjustment bolts, enhancing strength and versatility.
• Sold in Pairs: Each package includes a set of two axle blocks for a complete installation.

Image: Overview of the JFG RACING blue axle blocks, showing the product itself, a dirt bike, and a close-up of the installed block on a wheel.

Image: Detailed view of the axle blocks highlighting the clear and precise adjustment marks for accurate alignment.

Installation Guide

Safety First: Always ensure your motorcycle is stable on a stand before performing any maintenance or installation. Wear appropriate safety gear. If you are unsure about any step, consult a professional mechanic.

1. Prepare the Motorcycle: Place your dirt bike on a suitable stand so that the rear wheel is off the ground and stable.
2. Loosen Axle Nut: Using the appropriate wrench, loosen the rear axle nut. Do not remove it completely yet.
3. Loosen Chain Adjuster Bolts: Loosen the existing chain adjuster bolts on both sides of the swingarm.
4. Remove Old Axle Blocks: Carefully slide the rear wheel forward to create slack in the chain. Remove the old axle blocks from both sides of the swingarm.
5. Install New Axle Blocks: Insert the JFG RACING Axle Blocks into the swingarm slots, ensuring they are oriented correctly. The adjustment marks should face outwards for visibility.
6. Adjust Chain Tension: Using the chain adjuster bolts, adjust the chain tension to the manufacturer's recommended specifications. Use the clear adjustment marks on the new blocks to ensure both sides are aligned equally for proper wheel alignment.
7. Tighten Axle Nut: Once the chain tension and wheel alignment are correct, tighten the rear axle nut to the motorcycle manufacturer's specified torque.
8. Final Check: Double-check all bolts and nuts for tightness. Rotate the wheel to ensure the chain moves freely and has the correct tension.

Image: A close-up view demonstrating the JFG RACING axle block correctly installed on the rear axle of a dirt bike, showing its position within the swingarm.

Image: Composite image showing various angles of the JFG RACING axle blocks installed on a motorcycle, illustrating their fit and appearance.

Operation and Adjustment

The JFG RACING Axle Blocks simplify chain tension and wheel alignment. After installation, regular checks are recommended.

• Chain Tension: To adjust chain tension, loosen the rear axle nut slightly. Then, turn the chain adjuster bolts on both sides of the swingarm. Turn them clockwise to tighten the chain (move the wheel backward) or counter-clockwise to loosen the chain (move the wheel forward).
• Wheel Alignment: The engraved marks on the axle blocks are crucial for accurate wheel alignment. Ensure the same mark is visible on both the left and right axle blocks relative to the swingarm. This ensures your rear wheel is perfectly straight, which is vital for handling and tire wear.
• Final Tightening: Once the desired chain tension and alignment are achieved, securely tighten the rear axle nut to the manufacturer's specified torque.

Maintenance

Proper maintenance will extend the life and performance of your JFG RACING Axle Blocks.

• Regular Cleaning: Clean the axle blocks regularly, especially after riding in muddy or dusty conditions. Use a mild cleaner and soft cloth to avoid damaging the anodized finish.
• Inspection: Periodically inspect the blocks for any signs of wear, damage, or deformation. Check the adjustment marks for clarity.
• Fastener Check: Ensure the axle nut and chain adjuster bolts remain properly torqued. Loose components can lead to poor performance or damage.
• Lubrication: While the blocks themselves do not require lubrication, ensure the axle and chain are properly lubricated according to your motorcycle's maintenance schedule.

Troubleshooting

Issue: Axle blocks do not fit my motorcycle.

Solution: Verify that your motorcycle's make, model, and year are listed in the "Compatibility" section of this manual. These blocks are designed for specific Yamaha YZ250F (2012-2022) and YZ450F (2010-2022) models. If your model is not listed, the blocks may not be compatible. Contact JFG RACING support for further assistance.

Issue: Axle blocks appear to be bending or deforming under stress.

Solution: Ensure the axle nut is tightened to the motorcycle manufacturer's specified torque. Overtightening or undertightening can cause undue stress. While made from durable 6061-T6 aluminum, extreme impacts or improper installation can lead to damage. If the product appears defective, cease use immediately and contact JFG RACING customer support.

Issue: Difficulty achieving precise wheel alignment.

Solution: Ensure the adjustment marks on both axle blocks are clean and clearly visible. Make small, equal adjustments to both chain adjuster bolts, referencing the marks carefully. It may be helpful to measure from the swingarm pivot to the axle center on both sides for absolute precision if the marks are difficult to read or trust.

Official Product Videos

No official product videos from the seller are available for this product at this time.

Warranty and Support

Specific warranty details for the JFG RACING Dirt Bike Rear Axle Blocks are not provided in this manual. For warranty claims, technical support, or any product-related inquiries, please contact JFG RACING directly through their official website or the retailer from whom the product was purchased. Keep your proof of purchase for any warranty claims.