ENGINE
2.2
When tightening bolts, nuts, or screws, a torque pattern should be followed to insure uniform equal tension is
applied to all fasteners. Proper torque application prevents fasteners from loosening or breaking in critical service.
It also minimizes wear and eliminates premature or needless repair costs. Following uniform torque application
sequence patterns assures optimum performance from precision machined, close tolerance assemblies. On vital
engine parts, torquing negligence could be costly.
Torque is a force which tends to produce rotation. The measurement of this force is expressed in units of force and
length. There are at present two basic systems of units used to express torque, English and Metric. In the English
system, the units of force are the pound or ounce, and the length is the foot or inch.
In the Metric system, the unit of force is expressed in grams (gm) or Newton meters (Nm), and length as
centimeters (cm.) or meters (m). The most common units of torque in the English system are ft. lb. and in. lb. In
the Metric system, torque is commonly expressed in units of Nm. Multiply foot pounds by 1.382 to obtain Nm.
See page 2.3 for engine torque sequences
Engine
Cylinder Head* Cylinder
Base Nuts
Crankcase
8mm
Crankcase
10 mm
Flywheel
EC-45 18-19 ft. lbs.
(25-26.5 Nm)
24-28 ft. lbs.
(33-39 Nm)
17-18 ft. lbs.
(22-23 Nm)
23-25 ft. lbs.
(32-35 Nm)
60-65 ft. lbs.
(83-90 Nm)
S44**
SN60-44**
SN50**
20-24 ft. lbs.
(28 - 33 Nm)
30-34 ft.lbs
(42-47 Nm)
20-24 ft.lbs.
(28 - 33 Nm)
N/A
90 ft. lbs.
(124 Nm)
SN60-70**
SN70**
SN80**
18-22 ft. lbs.
(25 - 30 Nm)
30-34 ft.lbs
(42-47 Nm)
20-24 ft.lbs.
(28 - 33 Nm)
26-30 Ft lbs
(36-42 Nm)
90 ft. lbs.
(124 Nm)
**Torque head bolts prior to torquing cylinder base nuts. Apply loctitet 242.
All 6mm Crankcase Bolts 108 in. lbs. (12.4 Nm).....
All 7/16-14 Engine Mount Strap Bolts 44-48 ft. lbs. (60-66 Nm).....
Spark Plugs
Polaris Part
Number
Spark Plug
3070156 NGK BR8ES
3070157 NGK BR7ES
3070160 NGK B7ES
3070161 NGK B8ES
3070162 NGK B9ES
3070163 NGK BR9ES
3070165 Champion RN2C
3070166 Champion RN3C
3070184 Champion RN57YC
3070190 Champion RN57YCC
3070198 NGK BR8EV
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