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. . . knocks, pinks
Improper fuel
(insufficient knock-
resistance), too much
spark advance
Mechanical causes:
Big-end bearing,
crankshaft bearing,
gudgeon pin worn
out, too much piston
play
Engine runs, but
. . . hisses
Insulator or plug
broken, plug
insufficiently
tightened, plug
sealing or faying
surface of cylinder
cover defective,
breather screw not
tightened
Engine stops by
itself . . .
. . . gradually after
misfiring
Insufficient fuel feed
due to gas bubbles,
water or dirt in
carburetter, plug
carbonized, oily
C o n s u l t
w o r k s h o p .
Remedy the respective cause or
c o n
s u i t
w o r k s h o p .
* 3
o
c
CO
m
CO
o
o
z
Q
C o n s u l t
w o r k s h o p .
r
S3
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