Introduction
This instruction manual provides essential information for the proper installation, operation, and maintenance of your ACTIVLIFE carburetor kit. This kit is specifically designed as a replacement part for STIGA Combi 48 SQ petrol lawn mowers equipped with the ST 45 OHV engine. Adhering to these instructions will help ensure optimal engine performance and longevity of the carburetor.
Product Overview
The ACTIVLIFE carburetor kit includes all necessary components for a comprehensive replacement. Please verify that all parts listed below are present and undamaged before proceeding with installation.

Image 1: Complete ACTIVLIFE Carburetor Kit. This image displays the main carburetor unit, three different shaped gaskets, a spark plug, a black foam air filter, an orange pleated paper air filter, a clear fuel filter, a black fuel line, and two metal clamps.
- Carburetor Unit: The primary component responsible for mixing air and fuel.
- Gaskets: Various shapes and sizes for sealing connections and preventing leaks.
- Spark Plug: Ignites the air-fuel mixture in the engine cylinder.
- Air Filters (Foam and Paper): Essential for preventing dirt and debris from entering the engine.
- Fuel Line: Connects the fuel tank to the carburetor.
- Fuel Filter: Filters impurities from the fuel before it reaches the carburetor.
- Clamps: Secure the fuel line connections.
Setup and Installation
Proper installation is crucial for the correct function of the carburetor. If you are unsure about any step, it is recommended to seek assistance from a qualified service technician.
- Safety First: Ensure the lawn mower engine is cool and disconnected from the spark plug wire to prevent accidental starting. Drain the fuel tank if necessary.
- Remove Old Components: Carefully disconnect the fuel line, throttle linkage, and choke linkage from the old carburetor. Remove the mounting bolts and detach the old carburetor and associated gaskets.
- Clean Mounting Area: Thoroughly clean the engine's mounting surface to ensure a proper seal with the new gaskets.
- Install New Gaskets: Place the appropriate new gaskets in their correct positions. Refer to your lawn mower's service manual for specific gasket placement if needed.
- Mount New Carburetor: Position the new ACTIVLIFE carburetor onto the engine, aligning it with the mounting bolts. Secure it with the original mounting bolts, tightening them evenly to prevent warping.
- Connect Linkages: Reattach the throttle and choke linkages to the new carburetor. Ensure they move freely and operate correctly.
- Install Fuel System Components: Replace the old fuel line and fuel filter with the new ones provided in the kit. Secure the fuel line with the new clamps. Ensure the fuel filter is installed with the arrow pointing towards the carburetor.
- Replace Spark Plug: Remove the old spark plug and install the new spark plug from the kit. Tighten to the manufacturer's specifications.
- Install Air Filters: Insert the new foam and paper air filters into the air filter housing. Ensure they are seated correctly to provide proper filtration.
- Refill Fuel: Refill the fuel tank with fresh, appropriate fuel for your lawn mower.
Operating Instructions (Post-Installation)
After installation, follow these steps for initial engine start-up and operation:
- Prime the Engine: If your mower has a primer bulb, press it several times until fuel is visible in the fuel line or bulb.
- Choke Setting: Set the choke lever to the "CHOKE" or "START" position.
- Start Engine: Pull the starter cord firmly or engage the electric starter.
- Warm-up: Once the engine starts, gradually move the choke lever to the "RUN" position as the engine warms up.
- Check for Leaks: While the engine is running, carefully inspect all fuel line connections and carburetor mounting points for any fuel leaks. Address any leaks immediately.
- Adjustments: The carburetor is typically pre-set. If the engine runs rough or stalls, minor idle speed adjustments may be necessary. Consult your mower's service manual for specific adjustment procedures.
Maintenance
Regular maintenance of your carburetor and associated components will ensure reliable performance of your lawn mower.
- Air Filter: Inspect the air filters (foam and paper) regularly, especially in dusty conditions. Clean the foam filter with warm, soapy water, rinse, and allow to dry completely before re-oiling lightly. Replace the paper filter annually or more frequently if it appears dirty or clogged.
- Fuel Filter: Replace the fuel filter annually or if it appears clogged or discolored. A clogged fuel filter can restrict fuel flow and cause engine performance issues.
- Spark Plug: Inspect the spark plug annually. Clean any carbon deposits and check the gap. Replace if electrodes are worn or if the plug is fouled.
- Fuel System: Use fresh, clean fuel. Consider using a fuel stabilizer if the mower will be stored for extended periods to prevent fuel degradation and carburetor clogging.
- Carburetor Cleaning: If the carburetor becomes clogged due to old fuel or debris, it may require cleaning. This typically involves disassembling the carburetor, cleaning jets and passages with carburetor cleaner, and replacing gaskets. This procedure is best performed by experienced individuals or a service technician.
Troubleshooting
Here are some common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine will not start | No fuel, clogged fuel filter, fouled spark plug, incorrect choke setting. | Check fuel level, replace fuel filter, clean/replace spark plug, adjust choke. |
| Engine runs rough or stalls | Clogged carburetor jet, dirty air filter, old/stale fuel, improper idle adjustment. | Clean carburetor, replace air filter, use fresh fuel, adjust idle speed. |
| Engine lacks power | Dirty air filter, restricted fuel flow, worn spark plug. | Replace air filter, check fuel filter/line, replace spark plug. |
| Fuel leaks | Loose fuel line connection, damaged gasket, cracked fuel line. | Tighten clamps, replace damaged gaskets, replace fuel line. |
For persistent issues, consult a professional lawn mower service technician.
Specifications
- Product Type: Carburetor Kit
- Brand: ACTIVLIFE
- Compatibility: STIGA Combi 48 SQ Petrol Lawn Mower with ST 45 OHV Engine
- Model Number (Kit): ACTIVLIFE (as per product data)
- ASIN: B0DH225GJV
- GTIN/UPC: 669994732894
Warranty and Support
For warranty information or technical support regarding your ACTIVLIFE carburetor kit, please refer to the documentation provided with your purchase or contact the ACTIVLIFE customer service directly. Contact details are typically available on the product packaging or the manufacturer's official website.