Introduction
This instruction manual provides essential information for the proper installation, operation, and maintenance of your UpStart Components Replacement Inner Air Filter. This filter is designed as a compatible replacement for Grasshopper part numbers 100937 and 2508304-S. Adhering to these instructions will help ensure optimal engine performance and prolong the life of your equipment.
Safety Information
Always prioritize safety when working with machinery. Before attempting any installation or maintenance, ensure the equipment is turned off, cooled down, and disconnected from its power source (e.g., remove spark plug wire, disconnect battery). Wear appropriate personal protective equipment, such as gloves and eye protection. Refer to your equipment's original manufacturer manual for specific safety precautions.
Product Overview
The UpStart Components Replacement Inner Air Filter is engineered to protect your engine from harmful contaminants such as dirt, dust, and debris. By providing clean, filtered air, it helps maintain engine efficiency, improve fuel economy, and extend engine lifespan. Regular replacement of your air filter is a critical part of routine engine maintenance.

Figure 1: Angled view of the UpStart Components Replacement Inner Air Filter. This image shows the blue filter material encased in a white mesh, with black end caps.
Specifications
| Brand | UpStart Components |
| Model Number | LM-2508304-S-DL165 |
| Compatible OEM Part Numbers | Grasshopper 100937, Grasshopper 2508304-S |
| Product Dimensions | Approximately 2.5 x 2.9 x 10.5 inches |
| UPC | 711841352356 |
Setup and Installation
Replacing your inner air filter is a straightforward process. Follow these general steps, referring to your equipment's specific service manual for detailed instructions and location of the air filter housing.
- Prepare the Equipment: Ensure the engine is off and cool. Disconnect the spark plug wire or battery to prevent accidental starting.
- Locate Air Filter Housing: Identify the air filter housing on your Grasshopper equipment. It is typically a plastic or metal casing secured with clips, screws, or wing nuts.
- Open Housing: Carefully open or remove the cover of the air filter housing.
- Remove Outer Filter (if applicable): If your system uses both an outer and an inner filter, remove the outer filter first. Inspect it for damage or excessive dirt.
- Remove Old Inner Filter: Gently pull out the old inner air filter. Note its orientation for correct installation of the new filter.
- Clean Housing: Wipe the inside of the air filter housing with a clean, damp cloth to remove any accumulated dust or debris. Ensure no debris falls into the carburetor or engine intake.
- Install New Inner Filter: Insert the new UpStart Components Replacement Inner Air Filter into the housing, ensuring it seats properly and matches the orientation of the old filter.
- Reinstall Outer Filter (if applicable): If an outer filter was removed, reinstall it.
- Close Housing: Securely close the air filter housing cover, ensuring all clips, screws, or wing nuts are tightened.
- Reconnect Power: Reconnect the spark plug wire or battery.

Figure 2: Vertical view of the UpStart Components Replacement Inner Air Filter. This image highlights the full length and cylindrical shape of the filter element.
Note: Always ensure the filter is installed correctly and the housing is sealed to prevent unfiltered air from entering the engine.
Operating Considerations
Once the new air filter is installed, your equipment is ready for operation. The primary function of this filter is passive protection. No specific operational adjustments are required for the filter itself. However, it is important to be aware of environmental factors that can affect filter life and engine performance:
- Operating in dusty or sandy conditions will accelerate filter clogging.
- High pollen environments can also lead to faster filter accumulation.
- Regularly check the air filter housing for proper sealing to prevent unfiltered air bypass.
Maintenance
Regular maintenance of your air filter is crucial for engine health. UpStart Components recommends replacing your air filters every season for best performance, or more frequently if operating in harsh conditions.
Inspection:
- Periodically inspect the air filter for visible signs of dirt, debris, or damage.
- Hold the filter up to a light source. If light does not pass through easily, the filter is likely clogged and requires replacement.
- Check the rubber seals on the filter ends for cracks or deterioration, which can compromise the seal.

Figure 3: End view of the UpStart Components Replacement Inner Air Filter. This image shows the black end cap and the internal structure of the filter.
Cleaning (Not Recommended for Inner Filters):
While some outer air filters can be cleaned, inner air filters are generally designed for replacement rather than cleaning. Attempting to clean an inner filter can damage the filter media, reducing its effectiveness and potentially allowing contaminants into the engine. For optimal protection, always replace a dirty inner air filter with a new one.
Replacement Frequency:
- Standard Use: Replace at least once per mowing season or every 50-100 hours of operation.
- Heavy/Dusty Use: Replace more frequently, potentially every 25-50 hours or multiple times per season.
Troubleshooting
If you experience issues with your equipment's engine performance, a clogged or improperly installed air filter could be a contributing factor. Consider the following:
- Reduced Engine Power or Stalling: A severely clogged air filter restricts airflow to the engine, leading to a rich fuel mixture, reduced power, and potential stalling. Solution: Inspect and replace the air filter.
- Increased Fuel Consumption: An engine struggling for air due to a dirty filter will consume more fuel to maintain performance. Solution: Inspect and replace the air filter.
- Black Smoke from Exhaust: This can indicate an overly rich fuel mixture, often caused by insufficient air intake. Solution: Inspect and replace the air filter.
- Engine Not Starting: While less common for just an air filter, an extremely clogged filter can prevent an engine from starting. Solution: Check the air filter and ensure it's clean and properly installed.
- Unusual Engine Noises: If the air filter housing is not properly sealed, unfiltered air can cause whistling or sucking noises. Solution: Ensure the air filter is seated correctly and the housing cover is securely fastened.
If these steps do not resolve the issue, consult your equipment's service manual or a qualified technician.
Warranty and Support
This UpStart Components Replacement Inner Air Filter is covered by warranties offered solely by UpStart Components. This product is not affiliated with any OEM brands and is not covered under any warranties offered by the original manufacturers. For specific warranty details or technical support, please refer to the contact information provided by UpStart Components at the time of purchase or visit their official website.