2007-2010 Kawasaki Ultra 250X/260X/260LX PWC Factory Service Manual, Page 142Get this manual
FUEL SYSTEM (DFI) 3-83 Air Bypass System
Relief Valve Inspection
Connect vacuum gauge [Aj and syringe [Bj or fork oil level gauge to the vacuum hoses as shown Special ToolsFork Oil Level Gauge: 57001-1290
Air Flow [C]
Gradually raise the vacuum (lower the pressure) applied to the relief valveand check the valve operationWhen the vacuum is highthe relief valve should permit air to flowWhen the vacuum lowers to valve closing pressureit should stop air flowSpring [Aj Diaphragm [Bj Valve [C] High Vacuum [OJ Compressed Air Flow [Ej To Air Box [Fj If the relief valve does not operate as described, replace it with new oneLow Vacuum [Aj Compressed air can not flow [Bj
JI0700 2B S
o If the portion of is in atmospheric pressure, the portion
of becomes negative pressureThe standard of the above relief valve opening pressure can be calcurated by the followingStandardNegative Pressure (Portion of A)Atmospheric Pressure (Portion of B)