How to Install Motorcycle Bar End Weights

Bar end weights play a crucial role in motorcycle handling by counteracting vibrations from the engine and road, which can lead to hand fatigue during long rides. These weights, typically fitted at the ends of handlebars, also offer protection against impacts in minor crashes or drops. Proper installation ensures they function effectively without compromising safety or performance. This guide provides a complete walkthrough, from preparation to advanced troubleshooting, tailored for different bike models and handlebar types.

Why Install Bar End Weights?

Engine vibrations transmitted through handlebars are a common issue, especially on bikes with single-cylinder or high-revving engines. Bar end weights add mass at the extremities, altering the handlebar’s resonant frequency to minimize buzz. According to motorcycle engineering principles, this mass dampening reduces numbness in riders’ hands, improving control and comfort on extended tours or spirited rides.

Beyond vibration control, these weights act as crash protectors, absorbing energy from falls and preventing damage to levers and mirrors. Heavier weights provide better damping but may slightly affect steering feel, so selection depends on bike weight and riding style.

Essential Tools and Materials

Gathering the right tools beforehand prevents interruptions. Here’s what you’ll need:

• Allen key set (metric sizes, typically 4mm-8mm)
• Torx bits or screwdrivers for throttle housing removal
• Utility knife for trimming grips
• Expanding rubber adapters or spacers (model-specific)
• Torque wrench for precise tightening
• Lubricant or grip glue for reassembly
• Replacement bolts (M6/M8 threaded)

Most kits include adapters for hollow or threaded bars. Verify compatibility with your handlebar’s inner diameter, which ranges from 13.5mm to 19mm across brands like Renthal or OEM.

Preparation Steps Before Installation

Start by parking your motorcycle on a stable stand in a well-lit area. Clean the handlebar ends to remove dirt or residue, which could hinder secure fitting. Inspect existing bar ends or caps—many bikes come with stock weights that must be removed first.

For bikes with rubber-mounted weights (e.g., certain Kawasaki models), note any spacers required. Measure thread engagement: aim for 10-15mm to avoid loosening under vibration. If grips are closed at the ends, carefully cut them open with a utility knife, avoiding damage to the bar itself. Roll back grips and clean internals for smooth throttle operation post-install.

Installing on Threaded Handlebar Ends

Many factory handlebars feature pre-threaded ends (M8 common). Removal of stock caps is straightforward:

1. Insert the correct Allen key into the stock weight’s set screw.
2. Turn counterclockwise while holding the weight to prevent rotation.
3. Once loose, pull the weight out; some resistance from rubber dampers is normal.

For new weights:

• Select the matching bolt length from the kit.
• Thread into the bar end, achieving full nut engagement without bottoming out.
• Torque to manufacturer specs, often 10-15 Nm, to secure firmly.

Test throttle twist and brake lever movement to ensure no binding.

Handling Hollow Handlebars

Hollow bars lack threads, requiring expansion fittings. Common on aftermarket bars like Barracuda or LSL:

Steps include inserting the expander into the bar end, then tightening the bolt to flare it outward, creating a friction lock. Squeeze if needed for initial fit, then torque gradually. This method suits bikes like Yamaha models without factory threads.

Special Cases: Honda and Other Models

Honda bikes often have rotating weights with internal clips. To convert to hollow installation:

• Left side: Roll back grip, depress top/bottom clips via bar holes using a screwdriver.
• Right side: Disassemble throttle housing, slide grip inward, press clips while pulling weight.
• Remove burrs post-extraction to maintain throttle freedom.

Suzuki V-Strom or GSX models may reuse the original 110mm bolt with spacers. Kawasaki rubber-mounted setups need extra spacers in the weight’s outer end. Always secure any accompanying straps or guards if part of the kit.

Advanced Installations with Handguards

Integrating bar end weights with handguards, like Barkbusters BBZ, adds weather protection. Key tips:

• Insert aluminum anti-rotation strips into guard pockets.
• Use spacers for lever clearance.
• Tighten to OEM torque specs.

For two-point mounts, pass bolts through guards and backbones before reattaching. This setup enhances cold-weather riding without sacrificing weight benefits.

Troubleshooting Common Issues

Vibrations persisting? Check torque and adapter fit—loose fittings amplify buzz. Throttle sticking? Trim grips precisely and deburr ends. Weights spinning? Ensure anti-rotation features or clips are engaged.

For heavy bikes like FJR1300, compare OEM vs. aftermarket weights for optimal balance. If bars are tapered, custom machining may be needed, but kits usually accommodate.

Maintenance and Upgrades

Periodically inspect for looseness, especially after rough trails. Upgrade to heavier weights (200-300g) for high-vibe engines or lighter for agile sportbikes. Combine with bar-end mirrors or sliders for multifunctional ends.

Proper install extends component life, reducing fatigue on grips and controls. Track ride feel pre- and post-install to fine-tune.

Frequently Asked Questions (FAQs)

Mastering bar end weight installation boosts your bike’s usability and safety. With practice, it becomes a quick maintenance task, ensuring every ride is smoother and more enjoyable.