Post by Bob Vehring on Dec 28, 2010 23:18:59 GMT -5
Below is a table that ammends the 2010-2011 ISR book. In 120/4 Stroke Racing section, Stock Class, Engine, Item 12, table 'b' is replaced with the table below:
Valve Spring Pressures
(In inches and PSI)
Valve Closed Height
Valve Open Height
Valve Closed Pressure
Valve Open Pressure
Pre-2010 Arctic Cat
0.955
0.735
26.0
35.0
2010+ Arctic Cat Exhaust
-
0.574
-
24.0
2010+ Arctic Cat Intake
-
0.678
-
21.0
Polaris
0.850
0.625
27.0
38.0
Ski Doo
0.835
0.613
20.0
25.0
Valve Spring Pressures
(In inches and PSI)
Valve Closed Height
Valve Open Height
Valve Closed Pressure
Valve Open Pressure
Pre-2010 Arctic Cat
0.955
0.735
26.0
35.0
2010+ Arctic Cat Exhaust
-
0.574
-
24.0
2010+ Arctic Cat Intake
-
0.678
-
21.0
Polaris
0.850
0.625
27.0
38.0
Ski Doo
0.835
0.613
20.0
25.0