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 |