Checking The Engine Oil Level

ENGINE

                                                            • Rider seat
          Standard compression pressure                       Refer to “GENERAL CHASSIS” on page 4-1.
          (at sea level)
            1600 kPa/400 r/min (228 psi/400               EAS20750

            r/min) (16.0 kgf/cm²/400 r/min)               CHECKING THE ENGINE OIL LEVEL
          Minimum–maximum                                 1. Stand the vehicle on a level surface.
            1390–1790 kPa (197.7–254.6 psi)           NOTE:
            (13.9–17.9 kgf/cm²)
                                                          • Place the vehicle on the centerstand.
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                                                          • Make sure the vehicle is upright.
a. Set the main switch to “ON”.                           2. Start the engine, warm it up for several min-
b. With the throttle wide open, crank the engine             utes, and then turn it off.
   until the reading on the compression gauge             3. Check:
   stabilizes.                                             • Engine oil level
NOTE:                                                        The engine oil level should be between the
The difference in compression pressure be-                   minimum level mark “a” and maximum level
tween cylinders should not exceed 100 kPa (1                 mark “b”.
kg/cm², 14 psi).                                             Below the minimum level mark → Add the
                                                             recommended engine oil to the proper level.
c. If the compression pressure is above the
   maximum specification, check the cylinder
   head, valve surfaces and piston crown for
   carbon deposits.
   Carbon deposits → Eliminate.
d. If the compression pressure is below the min-
   imum specification, pour a teaspoonful of en-
   gine oil into the spark plug bore and measure
   again.
   Refer to the following table.
 Compression pressure (with oil applied into
 the cylinder)                                                       Type
                                                                      YAMALUBE 4 (20W40) or
Reading                  Diagnosis                                    SAE20W40
Higher than without      Piston ring(s) wear or                      Recommended engine oil grade
oil                      damage → Repair.                             API service SE, SF, SG type or
                                                                      higher
                         Pistons, valves, cylin-
                         der head gasket or               ECA13380
Same as without oil      piston ring(s) possi-            CAUTION:
                         bly defective → Re-
                                                          • Engine oil also lubricates the clutch and the
                         pair.
                                                            wrong oil types or additives could cause
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲                            clutch slippage. Therefore, do not add any
8. Install:                                                 chemical additives.
 • Spark plug                                             • Do not allow foreign materials to enter the
                                                            crankcase.
          Spark plug
                                                      NOTE:
    T.     13 Nm (1.3 m·kg, 9.4 ft·lb)
                                                          • API Service “SE”, “SF” and “SG” type or equiv-
     R.

9. Connect the all spark plug caps.                         alent (e.g., “SF-SE”, “SF-SE-CC”, “SF-SE-
10.Install:                                                 SD”)
 • T-bar                                                  • Before checking the engine oil level, wait a few
   Refer to “GENERAL CHASSIS” on page 4-1.                  minutes until the oil has settled.
 • Fuel tank
   Refer to “FUEL TANK” on page 7-1.

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