Check the engine oil level as follows:

The engine oil level should be between "L" (Low) and "f" (full) lines.
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Caution The engine oil level must be between the " l'' (low) line and "f" (full) ~i ne, or engine damage may occur. Check the oil level, through the inspection window, with the motorcycle held vertically on level ground before each use of the motorcycle. |
Engine oil
Engine oil and filter changeCooling fan inspection
Cooling fan operating temperature
standard
(on → off): approx. 100 ?‹C (212 ƒ‹f)
(off → on): approx. 105 ?‹C (221 ƒ‹f)
Inspect the cooling fan in the following procedures:
disconnect the cooling fan motor coupler (1).
Test the cooling fan motor for load ...
Evaporative emission control system
diagram (only for e-33)
Fuel tank
Fuel-vapor separator
Fuel pump
Fuel feed hose
Fuel shut-off valve
Iap sensor
Surge hose
Evap canister
Purge hose
Evap system purge control solenoid valve
Fue
Hc vapor
Fresh air
Vacuum
...
DTC “c28” (p1655): secondary throttle
valve actuator (stva) malfunction
Detected condition and possible cause
Detected condition
Possible cause
The operation voltage does not reach the stva.
Ecm does not receive communication signal from the
stva. Stva can not operate properly or its motor locked
Stva malfunction.
...