Arctic Cat EL TIGRE 5000 1981 Operator's Manual page 26

SPARK PLUGS
The recommended spark plugs to use on the 5000
are NGK BR9ES and on th e 6000 are NGK
BR10EV. Correct gap is 0.5 mm (0.020 in.). Varying
terrain co nditio ns and oper ating usag e may re-
quire spark plug s of a d iffe rent heat range. For ex-
ampl e, sustained cross-countr y riding will usuall y
require colder heat-range spark plugs while trai l
riding or ot her cont inual slow speed operatio n wi ll
usuall y require hotter heat-range spark pl ugs.
Check ing Spark Plugs
To see if the spark plugs being used are of the pro-
per heat range after the sno wmobi le has been
ope rated unde r normal driving co nditions, pull th e
spark plu g caps off the spark plu gs, remove th e
spa rk plu gs, and examine the cond it ion of th e
cente r el ectrode insul ator of each spark plug (Fig .
18).
Fig. 18
Center Electrode
Insulator
0725-048
A. TAN or LIGHT BROWN insulato r indicates
co rrect spark plugs (heat range).
24
B. LIGHT GRAY or WHITE insulat or indicates
overheating of the engine . Thi s co ndition
is caused by a too lean cond it ion or incor-
rect spa rk plugs (heat range too hot).
C. BLACK ins ulator indicates fuel in the co m-
bustio n chamber is not burning complete-
Iy. This cond ition is caused by a too rich
condit ion , too much oil, or inc orrect spark
plugs (heat range too cold).
•
NOTE: If the c enter electrode insulators are
light gray, white, or black and if the ca r-
buretor adjustments and ignition timing are cor-
rect, different heat-range spark plugs may be
nece ssary. Authorized Arctic Cat Snowmobile
dealers have detailed spark plug information. It
may be wise to consult you r dealer before chang-
ing spark plugs, as incorrect heat-range spa rk
plugs could cause poor engine performance or
engine damage.
• CAUTION •
If only one spark plug is light gray, white, or hlack and
the other spark plug
is
tali or light brown, take the
snowmohile to an authorized Arctic Cat Snowmobile
dealer for inspection and servicing.
BRAKE
Arc t ic recom mends that the brake syste m (brake
lever, brake lever trave l, wear indicator/jam nut
clearance, cab le, ca liper, spr ing, and disc) be
checked dail y for wear or damag e and for smooth
operation.
....