APRILIA MSS Mana GT ABS Service Station Manual page 226

Engine
3 - Check the system pressure with cold engine and medium - high speed.
Standard pressure < 6 bar
YES go to point 4 NO go to point 5
4 - Replace the damaged components.
5 - Check the adjustment by-pass efficiency and restore the proper sliding.
NOTE
STANDARD PRESSURES ARE OBTAINED USING OIL WITH THE PRESCRIBED VISCOSITY. A
HIGHER VISCOSITY CAUSES AN INCREASE OF THE SYSTEM PRESSURE.
1 - If oil consumption is higher than 250 gr/1000 km on run-in engine, proceed as follows.
CONTINUE go to point 2
2 - Check the presence of oil at the recovery duct on the filter housing.
YES - go to point 3 NO go to point 4
3 - Check the efficiency of the one-way reed valve and the decantation chamber drainage hole.
YES - go to point 5 NO go to point 4
4 - Check the thermal group seals (piston rings, valve guides and oil seals), see the "Thermal group
and Timing system" chapter.
5 - Restore the valve or the drainage hole efficiency.
Oil pump
KEY:
A. Delivery pump
B. Recovery pump
ENG - 226
MSS Mana GT ABS