Polaris 2007 Sportsman 450 EFI, Service Manual

Page: 64 / 406

3.6
ENGINE
GENERAL ENGINE SERVICE
Piston Identification
The piston may have an identification mark or the piston may
not have an identification mark for piston placement. If the
piston has an identification mark, follow the directions for
piston placement below. If the piston does not have an
identification mark, the direction for placement of the piston
does not matter.
Note the directional and identification marks when viewing the
pistons from the top. The letter “F”, “
J
”,“
X
” or : must always
be toward the flywheel side of the engine. The other numbers are
used for identification as to diameter, length and design. Four
stroke engine rings are rectangular profile. See text for oil
control ring upper rail installation. Use the information below to
identify pistons and rings.
*Pistons and rings marked 25 equal .25mm (.010”) oversized
*Pistons and rings marked 50 equal .50mm (.020”) oversized
Cooling System Specifications
THERMISTOR READING DURING OPERATION
Engine
Model No. Oversize
Available* (mm) Piston
Length Standard
Piston
Identification
EH50PLE .25
.50 72 mm C
EH42PLE .25
.50 66 mm B
Condition
Approx. Reading
(Min-Max)
Temperature
Temperature 37.3 - 39.2 k
Ω
68 ° F ( 20 ° C)
System
Capacity
2.25 Quarts
(2.13L)
Radiator Cap
Relief
Pressure
13 PSI (89.6 kpa)
Sensor
18.5 + ft. lbs.
(25 Nm)