Briggs & Stratton Twin Cylinder L-Head Repair Manual page 16

DO NOT use petroleum solvents, such as kerosene, to
clean paper cartridge. They may cause cartridge to
deteriorate. DO NOT oil paper cartridge. DO NOT use
pressurized air to clean or dry paper cartridge.
b. Reinstall cartridge, cover plate, knob and
pre-cleaner.
2. Reinstall air cleaner cover, Fig. 6 or Fig. 7.
Fig. 6 – Air Cleaner, Horizontal Crankshaft Models
(Typical)
Fig. 7 – Air Cleaner, Vertical Crankshaft Models
(Typical)
1
Remove Combustion Chamber Deposits
Combustion chamber deposits should be removed
every 100 – 300 hours or whenever cylinder heads are
removed. See Section 5 for removal procedure.
Remove combustion chamber deposits from combus-
tion chamber and around valves using a soft, hand wire
brush or scraper. With piston at Top Dead Center,
remove combustion chamber deposits from top of
piston. Use care to prevent combustion chamber
KNOB
deposits from entering push rod or oil return cavity in
COVER
cylinder.
Take care not to damage cylinder, top of piston,
NUT
cylinder head and cylinder head gasket surfaces.
WASHER
CUP
PAPER
CARTRIDGE
Remove the loose deposits from around the top ring
FOAM
land area using compressed air or a soft bristle
PRE-CLEANER
brush.
BASE
TROUBLESHOOTING
Most complaints concerning engine operation can be
classified as one or a combination of the following:
1. Will not start
2. Hard starting
3. Lack of power
KNOB
4. Runs rough
5. Vibration
6. Overheating
COVER
7. High oil consumption
WING
NUTS
CARTRIDGE
COVER
Systematic Check
If the engine will not start and the cause of malfunction
is not readily apparent, perform a systematic check in
PAPER
the following order:
CARTRIDGE
1. Ignition
FOAM
PRE-CLEANER
2. Carburetion
SPIT BACK
3. Compression
SHIELD
This check-up, performed in a systematic manner, can
usually be done in a matter of minutes. It is the quickest
BASE
and surest method of determining the cause of failure.
The basic check-up procedure is the same for all
engine models, while any variation, by model, will be
shown under the subject heading.
NOTE: Remove only the combustion chamber
deposits. It is not necessary to remove the
discoloration marks on the piston, valves
and cylinder head. These marks are
normal and will not affect engine operation.
WARNING: TO PREVENT eye injury always
wear eye protection when using compressed
air.
NOTE: What appears to be an engine malfunc-
tion may be a fault of the powered equip-
ment rather than the engine. If equipment
is suspect, see Equipment Affecting
Engine Operation.
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