Briggs & Stratton Pre-Filters
Genuine Briggs & Stratton foam pre-filters protect paper air filter elements extending filter life reducing replacement costs. We hold pre-filters in stock and sell worldwide. Pre-cleaners wrap around paper cartridges capturing large debris before reaching inner filter, extending paper filter lifespan from 25 hours to 100 hours operation. Clean pre-filters every 25 hours washing in warm soapy water, rinse thoroughly, air-dry completely before re-oiling. Replace pre-filters every season or 25 hours whichever occurs first. Properly oiled pre-cleaners feel uniformly tacky not dripping—excess oil migrates into paper filters clogging microscopic pores, causing engine performance loss, black smoke, and rough running.
Available Briggs & Stratton Pre-Filters
Pre Filter
493537S
Briggs & Stratton
£6.00
In Stock
Pre Filter
593217
Briggs & Stratton
£6.45
In Stock
Pre Filter
272490S
Briggs & Stratton
£5.80
In Stock
Pre Filter
798795
Briggs & Stratton
£6.05
In Stock
Air Filter Cartridge and Pre Filter
797033
Briggs & Stratton
£16.90
In Stock
Pre Filter
273638S
Briggs & Stratton
£9.45
In Stock
Pre Filter
797704
Briggs & Stratton
£5.65
In Stock
Pre Filter
492947
Briggs & Stratton
£5.20
In Stock
Pre Filter
798513
Briggs & Stratton
£5.25
In Stock
Pre Filter
271794S
Briggs & Stratton
£6.50
In Stock
Air Filter and Pre Filter
796970
Briggs & Stratton
£13.30
In Stock
Pre Filter
272403S
Briggs & Stratton
£4.50
In Stock
Frequently Asked Questions
How often should I clean my foam pre-filter?
Clean foam pre-filters every 25 hours operation or seasonally whichever occurs first. Dusty conditions require more frequent cleaning—potentially after every 10 hours or each mowing session. Replace pre-filters annually or when torn, brittle, or unable holding oil properly. Pre-filter maintenance extends paper cartridge life to 100 hours compared to 25 hours without pre-cleaner protection.
Why is excess oil on pre-filters a problem?
Excess oil migrates from foam pre-filter into paper cartridge clogging microscopic pores preventing proper airflow. Saturated paper filters cause rich fuel mixture producing black exhaust smoke, power loss, rough running, poor fuel economy. Over-oiled pre-filters create engine sputtering requiring premature paper filter replacement. If you can see oil pooling in foam pores you've applied too much—proper oiling makes foam tacky without visible oil accumulation.
Can I use a dry pre-filter without oiling it?
Dry foam pre-filters trap only largest particles allowing fine dust passing through into paper filter shortening filter life. Oiled foam captures smaller debris particles preventing premature paper filter contamination. Some manufacturer manuals specify dry pre-filters preventing over-oiling problems—consult engine specifications before oiling. When pre-filter is sole filtration (no paper cartridge behind), dry foam allows excessive dust entering cylinders causing accelerated wear. Always oil standalone foam filters.
What's the correct way to clean and oil a pre-filter?
Wash pre-filter in warm water with liquid dish soap squeezing gently releasing trapped dirt—never twist or wring forcefully damaging foam structure. Rinse thoroughly until water runs clear removing all soap residue. Squeeze excess water gently, air-dry completely overnight—installing damp filters draws dust inward causing engine damage. Apply fresh engine oil sparingly saturating foam evenly. Squeeze excess oil through clean cloth—filter should feel uniformly tacky not dripping wet.
What happens if I don't use a pre-filter?
Operating without pre-filter allows large debris directly contacting paper cartridge rapidly clogging microscopic pores reducing filter lifespan from 100 hours to 25 hours. Grass clippings, dust, pollen immediately saturate paper element requiring frequent costly replacements. Pre-filters provide first-stage filtration removing 70-80% large particles before air reaches paper filter. Missing pre-filters increase maintenance costs, reduce engine protection, cause more frequent filter changes. Always install pre-cleaners when dual-element filtration systems specified by manufacturer.