2002 Bombardier Quest 650XT Service Manual, Page 45Get this manual
Section 03 ENGINE Subsection 02 (TROUBLESHOOTING)
SYMPTOM CONDITION TestInspection
LOW OR NO OIL PRESSURE NORMAL USE10Check oil pressure regulator valve (spring) functionaValve spring damaged (valve always open)Replace springbValve piston is stuck in oil pump housingRepair valve piston11Check plain bearings in crankcase for heavy wearaPlain bearings out of specification (increased clearance)Replace plain bearings
SYMPTOM CONDITION TestInspection