BF15DSBF20D
1.
Check the fuel level in the tank.
No fuel in the tank
-
Add fuel.
Sufficient fuel in the tank
+
Not reaching the
carburetor
2. Loosen the carburetor drain screw
and check whether fuel reached the
,
carburetor.
Check for collapsed or pitched fuel
line.
Check for clogged fuel tank breather
hole: Close the tank and open the
vent knob, listen for hiss.
Check for air leaks past primer bulb.
Squeeze the primer bulb and be
sure that the fuel is reaching the
motor.
Check for clogged fuel filter, fuel
tubes and connector.
Check the fuel pump.
Check for blockage in the carburetor
Reaching the carburetor.
No spark
or
weak
-.
sparks
Perform IGNITION
SYSTEM
trou-
bleshooting (P. 2-16).
L
Wet
4
Clean the electrode and restart, tak-
I I
ing care that the choke is not closed
1
too much.
If
excessive wet, check the carbure-
tor for flooding. If flooding is severe,
drain the carburetor and prime
again, or check the carburetor float
I
1
I
Good sparks
5.
Check compression of each cylinder
(P.
2-12).
Normal compression
,
Reinstall the spark plugs securely and
restart the engine according to the
Low compression
+
Check that the valve clearance is
correct.
Check for defective cylinder head
gasket, valves or valve seats.
Check that the cylinder head is cor-
rectly tightened.
Check for worn piston, piston rings
or cylinder.
2-1
1
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