10 BR 500, BR 550, BR 600
4.4 Engine
Always check and, if necessary, repair the following parts before looking for faults on the engine:
– Air filter
– Fuel system
– Carburetor
– Ignition system
Condition Cause Remedy
Engine does not start easily, stalls
at idle speed, but operates normally
at full throttle
Check compression Check combustion chamber
for excessive build-up of
combustion deposits, check
condition of valves and valve
clearance
Manifold leaking Seal or replace manifold
Oil seals on crankshaft defective Replace oil seals
Seal between cylinder and engine
pan leaking/damaged (cracks)
Seal or replace engine pan
Decompression lever sticking Install new cam gear
Engine does not deliver full power
or runs erratically
Piston rings worn or broken Install new piston rings
Muffler / spark arresting screen (if
fitted) carbonized
Clean muffler (inlet and
exhaust openings), replace
spark arresting screen
(if fitted)
Secondary air seepage through
faulty flange or manifold
Replace faulty parts
Air filter element dirty Fit new air filter element
Fuel / impulse line kinked or
cracked
Fit new lines or position
without kinks
Pump diaphragm torn Install new pump diaphragm
Decompression lever sticking Install new cam gear
Engine pan defective (cracks) Replace engine pan
RA_452_00_01_02.book Seite 10 Donnerstag, 16. Februar 2012 11:52 11
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