Filter
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Combustion Chamber
Remove combustion chamber deposits every
500 hours or whenever the cylinder head is
removed.
With the piston at Top Dead Center (TDC),
scrape deposits from top of piston and upper
bore with a plastic scraper.
Remove the loosened deposits from around the
top ring land area using compressed air or a
shop vacuum and a soft bristle brush.
NOTICE: Use care to prevent debris from
entering push rod or oil return cavities in cylinder.
Do not damage bore, top of piston, cylinder
head, or cylinder head gasket surfaces.
It is not necessary to remove the discoloration
marks on the piston, valves, and/or cylinder
head. These marks are normal and will not affect
engine operation.
Air Filter
A correctly serviced air filter protects internal
engine parts from airborne dirt and dust. Poor
filter maintenance will allow dirt and dust to be
drawn into the engine, causing wear to the intake
system and contamination of the oil. Dirt in the oil
forms an abrasive mixture which wears down
moving parts.
NOTE: Snow engines do not have an air cleaner
assembly. Please refer to Snow Hood
Maintenance for disassembly procedures
NOTE: Do not use pressurized air or solvents to
clean the filter. Pressurized air can damage the
filter and solvents will dissolve the filter.
1. Disassemble air cleaner system.
2. Gently tap air filter cartridge on a hard
surface to loosen debris. Replace
cartridge if very dirty.
3. Wash foam filters and pre-cleaners in
warm, soapy water, then rinse and allow
to air dry. Saturate foam filters in clean
engine oil, then squeeze out access oil.
DO NOT OIL PRE-CLEANERS.
4. Drain and clean oil bath reservoirs, then
re-fill with clean engine oil.
5. Reassemble the air cleaner system.
Figures 5 through 16 illustrate the various air
cleaner systems found on Briggs & Stratton
single-cylinder OHV engines.
Figure 5
Figure 6
WARNING
Gasoline and its vapors are extremely
flammable and explosive.
Fire or explosion can cause severe
burns or death.
• Never start or run the engine with the air
cleaner assembly or the air filter removed.