Stens 100-004 with Pre-Filter

Keep your engine running clean and protected with this aftermarket air filter and pre-cleaner combo, Stens 100-004 air filter and Stens 100-907 pre-filter. Designed for select 31 and 33 series engines, this kit helps extend engine life by preventing dirt and debris from entering the carburetor.

✔ Quality aftermarket replacement
✔ Includes both air filter + pre-filter
✔ Exact fit — no guesswork

What’s Included:

• (1) Air Filter — Stens 100-004 (Replaces B&S 793569)
• (1) Pre-Cleaner — Stens 100-907 (Replaces B&S 793685)

Fits select Briggs & Stratton engines including:

• 31 Series Engines
• 33 Series Engines

Not sure if this fits your engine? Use our Engine Model Lookup Tool or check your model number stamped on the valve cover.

Why this matters:

Dirty air filters are one of the most common causes of:

• Hard starting
• Loss of power
• Excess fuel consumption
• Black smoke

Replacing both the air filter and pre-cleaner together ensures maximum airflow and engine protection.