Husqvarna SM 610 2006 Workshop Manual page 191

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E L E C T R IC S Y S T E M
S p a rk p lu g
U se "N G K " C P R 8 E sp a rk p lu g . C h e ck d ista n ce "A " (0 ,6 ÷0 ,7 m m /
0 .0 2 2 ÷0 .0 2 6 in .) b e tw e e n e le ctro d e s. A w id e r g a p m a y ca u se d ifficu ltie s
in sta rtin g e n g in e a n d in o ve rlo a d in g co il. A g a p th a t is to o n a rro w m a y
ca u se d ifficu ltie s w h e n a cce le ra tin g , w h e n id lin g th e e n g in e o r w h e n
p e rfo rm in g a t lo w sp e e d s. C le a n th e d irt a w a y fro m th e b a se o f th e s p a rk
p lu g b e fo re re m o vin g it fro m th e cylin d e r. It is ve ry u se fu l to e xa m in e th e
sta te o f th e sp a rk p lu g ju st a fte r it h a s b e e n re m o v e d fro m th e e n g in e
sin ce th e d e p o sits o n th e p lu g a n d th e co lo r o f th e in su la to r p ro vid e
u se fu l in d ica tio n s co n ce rn in g th e h e a t ra tin g o f th e p lu g , ca rb u re tio n ,
ig n itio n a n d g e n e ra l e n g in e co n d itio n . B e fo re re fittin g th e p lu g , th o ro u g h ly
cle a n th e in su la to r u sin g a b ra ss-m e ta l b ru sh . A p p ly a little g ra p h ite
g re a se to th e p lu g th re a d ; fit a n d scre w th e p lu g h o m e b y h a n d a n d th e n
tig h te n to th e co rre ct to rq u e (1 0 ÷1 2 N m ; 1 ,0 ÷1 ,2 3 K g m ; 7 .2 ÷8 .9 ft-lb )
u sin g a p lu g sp a n n e r. S p a rk p lu g s w h ich h a ve cra cke d in su la to rs or
co rro d e d e le ctro d e s sh o u ld b e re p la ce d .
N e u tra l p o s itio n s e n s o r c h e c k in g
W ith th e g e a r in n e u tra l p o sitio n (fig .5 ), d e ta ch th e co n n e cto r (1 ) o f th e w irin g o f
th e n e u tra l se n so r, g ro u n d a te ste r te rm in a l o n th e e n g in e , th e n in se rt th e o th e r
o n e in th e h o le w h e re is th e n e u tra l se n so r. T h e n c h e ck th e co n tin u ity.
1 9

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