AQBB 4" Aluminum Heat Sink for 4-inch Motors – Snap-In Fit for MY1020 MX650 MX500 SX500, Improved Cooling

AQBB's 4-inch aluminum snap-in heat sink cools 4" diameter motors such as MY1020, MX650, MX500 and SX500 to lower operating temperatures and protect the motor and pump from overheating.

This precision-engineered motor radiator is a drop-in aluminum heatsink designed to improve airflow and thermal transfer on 4-inch-diameter electric motors and Delavan FB-series pump motors. Built to replace or upgrade OEM cooling fins, the AQBB heatsink snaps onto compatible motors to expand surface area, speed heat dissipation, and reduce thermal stress during extended use. It's lightweight, corrosion-resistant, and tailored for common electric scooters, e-bikes, go-karts, and Delavan pump applications.

How does this heatsink lower motor temperature effectively?

The AQBB heatsink increases exposed surface area and channels airflow around the motor, accelerating heat transfer away from the windings and casing. Its fin geometry and aluminum composition create a faster path for thermal energy to move from the motor into the surrounding air without adding significant weight.

• High-conductivity aluminum alloy for rapid thermal transfer
• Optimized fin layout to improve convection around the motor
• Snap-in fit reduces thermal interfaces for better conduction
• Surface oxide layer for corrosion resistance and sustained performance

Which motors and Delavan pump models will this fit?

This heatsink is made for motors with a roughly 4" diameter, including common Razor motor models and the MY1020 family. It is explicitly compatible with many Delavan FB series pumps, including FB2, FB3 and FB6 standard part variants listed by manufacturer codes.

• Fits 4" diameter motors such as MY1020, MX650, MX500, SX500
• Compatible with Delavan FB2, FB3 and FB6 series pump models
• Works with a broad range of electric-bike, scooter, and go-kart retrofits

How easy is installation and maintenance?

The heatsink uses a snap-in design for straightforward installation without complex tools, and its aluminum body simplifies cleaning and corrosion management. Replacement or removal is quick, making routine inspection and service faster than many welded or bonded radiator options.

• Tool-minimal snap-in mounting for quick retrofits
• Lightweight design avoids extra mechanical load on motor bearings
• Durable finish resists grime and preserves thermal performance

What measurable benefits can I expect in real-world use?

While results vary with duty cycle and ventilation, an aluminum heatsink like this reduces steady-state motor temperatures by improving heat rejection and lowering thermal cycling stress. That can translate into longer component life and fewer heat-related performance losses during demanding runs.

• Improved cooling efficiency compared with cast-iron fins
• Reduced risk of overheating under extended load
• Potential for extended pump and motor service life due to lower operating temperatures

Who is this for: The AQBB 4" motor heat sink is aimed at DIY enthusiasts, e-bike and scooter owners, small electric vehicle hobbyists, and technicians who need a compact, effective cooling upgrade for 4" diameter motors and Delavan FB-series pumps. Choose this part if you want an easy-to-install, corrosion-resistant aluminum heatsink to enhance cooling, reduce overheating risk, and simplify maintenance on common motors used in scooters, e-karts, dirt-bike conversions, and pump-driven systems.