2004 Ski-Doo Racing Handbook, Page 67Get this manual
SECTION 04ENGINE PREPARATION
Bench Test for Checking RAVE Valve Operation
The operation of the valve can be checked by pressurizing the engine as one would when checking for crankcase leaksThe engine must be sealed at all exhaust flanges, all carburetor inlets, and at the fuel pump impulse fittingDepending on the design of your pressure test kit, you may be pressurizing the engine through the crankcase or right at the exhaust flange cover plateIf you are pressurizing through the crankcase, make certain the piston uncovers the exhaust port on the side you are checkingInstall the RAVE valve movement indicator (PN 861 725 800) in place of the red plastic adjuster on the diaphragm cover so that you can observe the diaphragm movement
The movement indicator must be turned all the way in to provide maximum spring pre-loadAs you begin pressurizing the engine using engine leak tester kit (PN 861 749 100), you will find the RAVE valve beginning to move at kPa (0.7 PSI or 20 inches of water) and the valve will be fully displaced when you reach 10 kPa (1.4 PSI or 40 inches of water)NOTE: Due to the low pressure conditions when using the leak tester kit (PN 861 749 100) to check the RAVE valve operation, install gauge with range of 0-200 inches of water (PN 861 749 100) on leak testerAs reference 6.89 kPa (PSI)27.71 inches of water