The Buckshot Racing #77 Mercury Racing Injector Screen Filter Kit is designed for the legendary side-injected Mercury Racing EFI systems used on high-performance 2-stroke outboards.
These replacement injector micro filters fit many Mercury Racing applications, including the 260 HP EFI, 280 HP EFI ROS, 300 Drag, and S3000/F1 engines, helping maintain proper fuel delivery and injector reliability at high RPM.
Each kit includes twelve replacement injector screen filters, enough to service a complete set of Mercury Racing EFI injectors.
Why Injector Screen Filters Matter
Inside every Mercury Racing EFI injector is a small stainless-steel micro filter located at the injector inlet. This filter acts as the final stage of filtration before fuel enters the injector body.
The filter captures debris, varnish, corrosion particles, and ethanol-related contamination that may pass through the fuel system. Because Mercury Racing EFI injectors rely on extremely precise fuel metering, even small contaminants can affect injector performance and fuel flow balance.
Restricted injector filters can contribute to:
- Lean cylinders
- Poor throttle response
- Unstable idle quality
- Reduced top-end performance
In severe cases, inconsistent fuel delivery can increase combustion temperatures and contribute to piston damage in high-performance applications.
Designed for Mercury Racing EFI Systems
These injector screen filters are specifically intended for Mercury Racing side-injected EFI systems commonly found on:
- Mercury Racing 260 HP EFI
- Mercury Racing 2.0 F1
- Mercury Racing 2.4 Liter Bridgeport
- Mercury Racing 280 HP EFI ROS
- Mercury Racing 300 Drag
- Mercury Racing S3000 and Formula 1 (F1) outboards
The stainless-steel mesh construction helps maintain proper fuel flow while protecting the injector’s precision internal components from contamination and wear.
Injector Service Recommendations
When replacing injector filters, injectors should also be professionally cleaned and flow tested whenever possible. It is also recommended to inspect or replace injector O-rings, seals, and pintle caps during service.
Balanced fuel flow is critical on Mercury Racing engines, especially at elevated RPM levels where small fuel delivery differences can impact performance and reliability.
OEM Reference Information
These replacement injector filters correspond to Mercury OEM part number 988181, making them a direct replacement for the original internal injector basket filters used in many Mercury Racing EFI systems.
Each kit includes: Twelve (12) replacement injector screen filters
The Buckshot Racing #77 Mercury Racing Injector Screen Filter Kit provides an important maintenance solution for preserving injector performance and fuel system reliability in Mercury Racing EFI engines.
Whether maintaining a 280 ROS, 300 Drag, or S3000 setup, clean injector filters help support consistent fuel delivery, stable combustion, and long-term engine protection.
For technical support, contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com