4. LUBRICATION SYSTEM VITALITY 50
SERVICE INFORMATION (4-STROKE)
GENERAL INSTRUCTIONS
· The maintenance of lubrication system can be performed with the engine installed in the frame.
· Use care when removing and installing the oil pump not to allow dust and foreign matters to
enter the engine and oil line.
· Do not attempt to disassemble the oil pump. The oil pump must be replaced as a set when it
reaches its service limit.
· After the oil pump is installed, check each part for oil leaks.
SPECIFICATIONS
Item Standard (mm) Service Limit (mm)
Inner rotor-to-outer rotor clearance 0.15 0.20
Oil pump Outer rotor-to-pump body clearance 0.150.20 0.25
Rotor end-to-pump body clearance 0.040.09 0.12
TROUBLESHOOTING
Oil level too low Poor lubrication pressure
· Natural oil consumption · Oil level too low
· Oil leaks · Clogged oil filter or oil passages
· Worn or poorly installed piston rings · Not use the specified oil
· Worn valve guide or seal
4-4
Fast delivery and good communication ! The parts fit perfectly ! Thank you very much ! 
4.7 / 5