NSU Supermax - Page 30

·'r
Plug 'Sooted' Up , ,
VelvetY, ,mait-black
carbon <!e.posits .. Tlie carburettor is set to ~ive.
too rich a ·mixture, i. 'e, jet n~eille is placed, too high,. 0; ~a!n jet .'
is too large"lnsufficienJ air. If I,he·fue.l tapis closed. while the en- .
, gine is running; and the throttle s'etting is, u'naltered, the, engine wiH',
sp.eed up be/ore it sfops" '
"
~I~g 'has a L1ghl-Coloureq Dep6sit
i. e, insula'tor is burnt white, "and has beads of molten metal ad-"
'hering to it; the'thread and eJeetrodes show signs' o~ ~verheating,
(plug has. cous~,d. hot-spol ignition);, Carburettdr set. to. give J60',wea~
'0 ,mixture, i, e. jet needle placed too ~ow;. main jet too small. Q(
partially blocked. The engine tends to stall, when accelerating, ,engIne
output is low, 'and engine overheats. "If thE! tickler knob is depressed
the engine iends ta speed up. .
, Plug
.lnsulolor lighl, Brown in Colo'ur
Body
of plyg dark grey in co '!;lUr; 1i.ght dry .carba~ depo~its on plug
b"dy·.
Carburettar settings are correct. .
. . If the plug fails to' sp~rk and, fo;~ig'n bodies, (soot :p~rti-:
des) are: discovered bet.~een the plug p~ints, it, is ·time. '
to dec'(;nbonise the cylind'er head' and -the crown' and
'un~erside o'f; the piston.
"
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56
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