Stens 100-640 with Pre-Filter

Keep your engine running clean and protected with this aftermarket air filter and pre-filter combo, Stens 100-640 air filter and Stens 100-648 pre-filter. Designed for select 21 series OHV engines. Designed for reliable performance, 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 and Pre-Filter — Stens 100-640 (Replaces OEM 794421)

(1) Pre-Filter — Stens 100-648 (Replaces OEM 697292)

Fits select Briggs & Stratton engines including:

• 21 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-filter together ensures maximum airflow and engine protection.

Specs    
Height 1 1/2"
Length 7 1/4"
Width 3 1/8"