Velocity stacks, also called intake trumpets, are designed to improve airflow into the carburetor, potentially enhancing throttle response and engine efficiency. The following selections compile 5 top-rated options available on Amazon, featuring various sizes and materials to fit common motorcycle carburetors. This guide highlights what to look for when choosing velocity stacks, so you can select the best match for your bike and riding style.
| Product | Brand | Key Size | Material | Notes |
|---|---|---|---|---|
| Speed Dealer Solid Brass Short Velocity Stack | Speed Dealer Customs | 1-3/16″ tall, 3″ diameter | Solid brass | Includes screen mesh and bolts |
| Amavoler 50mm Carburetor Air Filter Trumpet Velocity Stack | amavoler | 50mm mouth | Aluminum alloy | Red finish; multiple fitments |
| Motoforti 55mm Velocity Stack | Motoforti | 55mm mouth | Aluminum alloy | Long-lasting; universal fit |
| X AUTOHAUX 55mm Velocity Stack | X AUTOHAUX | 55mm mouth | Aluminum alloy | Universal dirt bike/ATV fit |
| ZSDTRP 50mm Velocity Stack With Sponge Filter | ZSDTRP | 50mm | Aluminum alloy | Includes sponge filter and mesh |
The following sections provide concise overviews of five velocity stacks that balance compatibility, build quality, and ease of installation. Each entry includes a quick reference to size, material, and notable features to help you compare options quickly.
Speed Dealer Short Velocity Stack
Brand: Speed Dealer Customs. This solid brass velocity stack is designed for S&S Super E G carburetors, with dimensions of 1-3/16″ tall and 3″ diameter. It ships with a screen mesh and stainless steel bolts for secure mounting. Brass construction is noted for durability and a distinctive finish that resists corrosion in various riding conditions. This unit emphasizes short-stature installation while maintaining a funnel effect to help air intake. Suitable for riders seeking a vintage look combined with reliable airflow performance.
Amavoler 50mm Red Velocity Stack
Brand: amavoler. This 50mm mouth velocity stack is crafted from lightweight aluminum alloy and finished in red. It’s designed to fit carburetor air filter mouths around 50mm (approximately 1.97 inches) and aims to smooth the inlet to improve airflow and overall motorcycle performance. The kit emphasizes easy installation and a snug fit, making it a practical option for riders upgrading intake efficiency on compatible carburetors.
Motoforti 55mm Velocity Stack
Brand: Motoforti. This 55mm velocity stack fits carburetor mouths at 55mm (2.17 inches) and is marketed as universal for many dirt bike, ATV, and motorcycle models from brands like Honda, Suzuki, Kawasaki, and Yamaha. It’s made from aluminum alloy, which resists rust and leaks. The product description notes a smooth funnel inlet to enhance airflow, contributing to potential gains in throttle response and intake efficiency on compatible carburetors.
X AUTOHAUX 55mm Velocity Stack
Brand: X AUTOHAUX. The 55mm velocity stack is designed for broad compatibility with many dirt bikes and ATVs, targeting a 55mm carb mouth. It’s constructed from aluminum alloy to resist corrosion and ensure durability over time. The funnel-shaped inlet is intended to optimize airflow, supporting improved performance for riders who want a straightforward upgrade to intake efficiency without major modifications.
ZSDTRP 50mm Velocity Stack With Filter
Brand: ZSDTRP. This 50mm velocity stack includes a sponge filter and steel mesh, delivering a compact option suitable for specific carburetor mouth sizes. The package contains one velocity stack, three screws, and filter components. It emphasizes high-efficiency filtration, ease of cleaning due to the steel mesh, and straightforward installation. The notes also advise verifying carburetor dimensions and space constraints to ensure fitment on a given bike.
Buying Guide: Key Purchase Considerations For Velocity Stacks
- Carburetor mouth size: Ensure the stack’s diameter matches your carburetor throat. Common sizes range from 50mm to 55mm; mismatches can restrict airflow or fail to seal properly.
- Material and durability: Aluminum alloys are lightweight and corrosion-resistant, while brass stacks offer a distinct aesthetic and robust construction. Your climate and maintenance habits influence durability expectations.
- Filtration and intake hygiene: Some stacks include filters or mesh; consider whether you want a filter for debris protection or a bare funnel for minimal obstructions.
- Fitment and compatibility: Many stacks advertise universal compatibility with popular brands. Double-check mounting points, bolts, and clearance with the frame and exhaust routing before purchase.
- Installation ease: Look for stacks that include necessary hardware, clear instructions, and compatible screw sizes. Easy installation reduces the risk of improper sealing or bolt failures.
- Aesthetics vs. function: Some stacks emphasize a vintage brass appearance, while others prioritize weight savings and airflow. Choose based on your build goals and maintenance readiness.
- Maintenance considerations: Some designs are easier to clean due to mesh or sponge elements; others are solid and require less frequent servicing but may trap more dirt if not paired with a filter.
- Riding conditions: For high-r humidity or dusty environments, consider filtration features and material coatings to resist corrosion and clogging.
- Cost-to-performance: While higher-end stacks may offer incremental gains, evaluate whether the expected improvement aligns with your engine power, carburetor type, and riding style.
In practice, velocity stacks are most beneficial when used with compatible carburetors and intake systems. They are commonly favored by riders seeking a throttle response boost and a straightforward upgrade path. Always verify fitment against your specific motorcycle model and consult service manuals or expert advice if you plan significant carburetion changes.