Introduction
Thank you for choosing the BEAR FLAG EDITION replacement carburetor. This manual provides essential information for the safe and effective installation, operation, and maintenance of your new carburetor. Please read this manual thoroughly before attempting any installation or maintenance procedures to ensure proper function and longevity of your generator.
Safety Information
Always prioritize safety when working with fuel systems and power equipment. Failure to follow safety instructions can result in serious injury or property damage.
- Disconnect Power: Before beginning any work, ensure the generator's spark plug wire is disconnected to prevent accidental starting.
- Fuel Handling: Work in a well-ventilated area. Fuel is highly flammable; avoid open flames, sparks, or smoking. Use an approved fuel container.
- Protective Gear: Wear appropriate personal protective equipment, including safety glasses and gloves.
- Engine Hot: Allow the engine to cool completely before performing maintenance to avoid burns.
- Read Generator Manual: Refer to your generator's original instruction manual for specific safety warnings and procedures related to your model.
Package Contents
Verify that all components are present and undamaged upon opening the package. The following items are typically included:

Image: The complete carburetor kit, including the main carburetor unit, fuel filter, various gaskets, a spark plug, ignition coil, fuel line, choke lever, and a shut-off switch.
- Carburetor Assembly
- Fuel Filter
- Gasket Set (multiple gaskets for mounting)
- Spark Plug
- Ignition Coil (or similar electrical component)
- Fuel Line
- Choke Lever
- Shut-off Switch
Installation Instructions
This section outlines the general steps for replacing your generator's carburetor. Specific procedures may vary slightly depending on your generator model. Always refer to your generator's service manual for detailed instructions.
- Preparation: Ensure the generator is turned off, cooled down, and the spark plug wire is disconnected. Drain the fuel tank into an approved container.
- Access Carburetor: Remove any air filter housing, shrouds, or other components that obstruct access to the carburetor.
- Disconnect Components: Carefully disconnect the fuel line, throttle linkage, choke linkage, and any electrical connections from the old carburetor. Note their positions for reassembly.
- Remove Old Carburetor: Unbolt and remove the old carburetor and its gaskets from the engine.
- Clean Mounting Surface: Thoroughly clean the engine's mounting surface to ensure a proper seal with the new gaskets.
- Install New Gaskets: Place the new gaskets in their correct positions. Ensure they are not creased or damaged.
- Install New Carburetor: Mount the new BEAR FLAG EDITION carburetor onto the engine, aligning it with the bolt holes. Secure it with the original bolts, tightening them evenly.
- Reconnect Components: Reconnect the throttle linkage, choke linkage, fuel line (installing the new fuel filter if applicable), and any electrical connections. Ensure all connections are secure and move freely.
- Reassemble: Reinstall any removed shrouds or air filter housing components.
- Refill Fuel: Add fresh, appropriate fuel to the generator's tank.
- Test for Leaks: Before starting, visually inspect all fuel connections for any signs of leaks.
- Reconnect Spark Plug: Reconnect the spark plug wire.
After installation, perform a test run to ensure the generator operates correctly and there are no fuel leaks.
Operating Instructions
Once the carburetor is installed, follow your generator's standard operating procedures. Here are general tips for starting and running your generator:
- Fuel Level: Ensure adequate fuel is in the tank.
- Oil Level: Check the engine oil level before each use.
- Choke: For cold starts, set the choke to the 'FULL CHOKE' position. As the engine warms up, gradually move the choke to the 'RUN' position.
- Starting: Follow your generator's specific starting procedure (e.g., pull cord or electric start).
- Warm-up: Allow the engine to warm up for a few minutes before applying a load.
- Shut-down: To stop the engine, turn the engine switch to the 'OFF' position.
Maintenance
Regular maintenance is crucial for the optimal performance and longevity of your generator and its carburetor.
Air Filter Maintenance

Image: Visual guide indicating signs that an air filter needs cleaning or replacement, such as reduced power, higher fuel consumption, starting issues, overheating, black smoke, and dirt buildup.
A clean air filter is essential for your generator's performance and efficiency. Regular maintenance helps your engine run smoothly, saves fuel, and extends its lifespan.
- Cleaning Schedule: Clean the air filter every 25 hours of use or more frequently in dusty conditions.
- Replacement Schedule: Replace the air filter once per season or after 300 hours to avoid engine issues.
- Signs for Replacement: Watch for reduced power, higher fuel consumption, starting issues, overheating, black smoke, or visible dirt buildup on the filter.
Fuel System Maintenance
- Fuel Filter: Inspect and replace the fuel filter annually or if fuel flow is restricted.
- Fuel Line: Check the fuel line for cracks, leaks, or deterioration regularly. Replace if necessary.
- Fuel Storage: Use fresh fuel and a fuel stabilizer if storing the generator for extended periods.
Spark Plug Inspection
- Inspection: Inspect the spark plug annually or every 100 hours. Look for signs of wear, carbon buildup, or damage.
- Replacement: Replace the spark plug if it is fouled, worn, or damaged. Ensure the correct gap is set according to your generator's specifications.
Troubleshooting
This section provides solutions for common issues you might encounter after carburetor replacement.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine will not start | No fuel, clogged fuel filter, incorrect choke setting, spark plug issue, improper carburetor installation | Check fuel level, replace fuel filter, adjust choke, inspect/replace spark plug, recheck carburetor connections |
| Engine runs rough or stalls | Dirty air filter, fuel quality, carburetor adjustment, vacuum leak | Clean/replace air filter, use fresh fuel, check for vacuum leaks around carburetor, consult a professional for carburetor adjustment |
| Reduced power output | Clogged air filter, fuel restriction, spark plug wear | Clean/replace air filter, check fuel filter and line, replace spark plug |
| Excessive fuel consumption | Dirty air filter, carburetor running rich | Clean/replace air filter, consult a professional for carburetor adjustment |
Specifications
- Product Type: Replacement Carburetor Kit
- Brand: BEAR FLAG EDITION
- Compatible Generator Models: Dayton 3W737C, 5U936C, 3W737D, 5U936D
- Engine Horsepower: 9HP
- UPC: 669990801105
Warranty and Support
BEAR FLAG EDITION products are manufactured to high standards. While specific warranty details are not provided in this manual, we stand by the quality of our replacement parts.
For technical assistance, troubleshooting guidance, or inquiries regarding your BEAR FLAG EDITION carburetor, please contact our customer support. Support is available every day to assist you with any questions or concerns.