Yamaha VMX12 2001 Service Manual page 89

MEASURING THE ENGINE OIL PRESSURE
3. Remove:
• main gallery bolt
WARNING
@
The engine, muffler and engine oil are
extremely hot.
@
4. Install:
• pressure gauge 1
• oil pressure adapter B 2
Pressure gauge
90890-03153
Oil pressure adapter B
90890-03124
5. Measure:
• engine oil pressure
(at the following conditions)
Engine oil pressure
25 kPa (0.25 kg/cm
Engine speed
Approx. 1,000 r/min
Engine oil temperature
60 ~ 70 °C
Out of specification → Adjust.
Engine oil pressure
Below specifica-
tion
Above specifica-
tion
6. Install:
• main gallery bolt
3 - 22
CHK
ADJ
2
, 0.25 bar)
Possible causes
• Faulty oil pump
• Clogged oil filter
• Leaking oil pas-
sage
• Broken or dam-
aged oil seal
• Leaking oil pas-
sage
• Faulty oil filter
• Oil viscosity too
high
12 Nm (1.2 m · kg)