Arctic Cat Sno Pro 120 2011, Service Manual

Page: 12 / 535

1-10
Cylinder Head Volume
Specifications (2-Stroke)

NOTE: For cylinder head volume tests, see appro-
priate Servicing Engine - Measuring Critical Compo-
nents sub-section in Section 2.
Crankshaft Runout/
Repair Specifications
(2-Stroke)
For those who have crankshaft work sent out to another
shop, provide them with this information.
To use the specifications, first refer to the drawing; then
find the letter indicating the specification and refer to the
chart below the illustration. Be sure to note the proper
engine row.

NOTE: We have given the proper location for check-
ing crankshaft runout as the very edge of the straight
portion of the shaft where the oil seal makes contact.
From the illustration, note that three check points are
called out: at either end, out on the taper as shown,
and also on the center bearing race. The crankshaft
is still supported on the outer bearings using V
blocks.
728-144A

NOTE: Measure in from the shaft end the specified
amount when checking runout at points D and F.
When checking runout in the center, place indicator
on center of bearing as shown at point E. Maximum
runout at any of the three measuring points is ±
0.002”.
Arctic Power Valve (APV)
System Specifications
(2-Stroke)

NOTE: The servo will activate once at APV cycle
RPM. If the servo cycles three times, cable length
adjustment or valve inspection is required.

NOTE: The 800 cc and 1000 cc have a three-stage
exhaust valve system. The stages are closed, mid-
open, and full-open. Each model has a designated
RPM at which the system is synchronized and
checked by the ECU for proper operation occuring
once each time the engine is started. The 800 cc sys-
tem is checked at 4800 RPM and the 1000 cc system
is checked at 6100 RPM (CFR/Crossfire/F-Series) or
at 6270 RPM (M-Series).
741-635A
ENGINE TYPE SQUISH - GAP
500 cc 0.059"
570 cc 0.066"
600 cc 0.059"
800 cc 0.059"
1000 cc 0.058"
CAUTION
These specifications are not intended to be used for
engine modification. Reducing the head volume to a
smaller specification could cause piston detonation
problems which is not a warranty situation.
Engine
A
± 0.006
B
± 0.006
C
± 0.015
(except
570)
G
Runout D
and F Point
± 0.002
500 cc 4.515” 2.618” 4.465” 1.062” D 5
0.196”
F 5
0.196”
570 cc 4.70” 2.45” 4.320” 0.945” D 30
1.181”
F 15
0.590”
600 cc 4.712” 2.519” 4.645” 1.181” D 5
0.196”
F 5
0.196”
800 cc 4.751” 2.519” 4.645” 1.181” D 5
0.196”
F 5
0.196”
1000 cc 5.10” 2.790” 5.040” 1.26” D 5
1.196”
F 5
0.196”
APV Position/RPM
ENGINE VALVE POSITION CYCLE RPM
600 cc Full-Open 73-7400 (Low/High Alt)
800 cc Mid-Open
Full-Open 66-7400 (Low/High Alt)
74-8100 (Low/High Alt)
1000 cc Mid-Open
Full-Open 6300 (Low/High Alt)
6500 (Low/High Alt)
F-Series
Manual
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