2004 Skidoo ZX Series Service Manual, Page 174Get this manual
Section 04 ENGINES (2-STROKE) Subsection 05 (OIL INJECTION SYSTEM)
Test Bench Connect hose filled with injection oil to main line fittingInsert other hose end in an injection oil containerUsing clockwise rotating drill rotate pump shaftOil must drip from outer fittings while holding lever in fully open positionIf not replace pump
Check Valve