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Transmission Oil
Servicing Your Honda 51
Transmission Oil
Refer to Important Safety Precautions on page23.
Using the proper oil, and regularly checking,
adding, and changing oil will help extend the
service life of the transmission and clutch. Even
the best oil wears out. Changing oil helps get rid of
dirt and deposits. Operating the engine with old or
dirty oil can damage your engine.
Running the engine with insufficient oil can cause
serious damage to the clutch and transmission.
* Suggested 4-stroke engine oils are equal performance
to SJ oils that are not labeled as energy conserving or
resource conserving on the circular API service label.
• Your CRF does not need oil additives. Use the
recommended oil.
• Do not use oils with graphite or molybdenum
additives. They may adversely affect clutch
operation.
• Do not use API SH or higher 4-stroke engine oils
displaying a circular API “energy conserving” or
“resource conserving” service label on the
container. They may affect lubrication and
clutch performance.
Other viscosities shown in the following chart may
be used when the average temperature in your
riding area is within the indicated range.
JASO T 903 standard
The JASO T 903 standard is an index for engine
oils for 4-stroke motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard is labeled on the oil
container. For example, the following label shows
the MA classification.
Oil Recommendation
API classification
(4-stroke engine oil
only)
SG or higher except oils
labeled as energy
conserving or resource
conserving on the circular
API service label
viscosity
(weight)
SAE 10W-30
JASO T903
standard
MA
others without friction modifiers as
molybdenum additives
suggested oil* Pro Honda GN4 4-stroke Oil
(USA & Canada), or Honda
4-stroke oil, or an equivalent
motorcycle oil
NOT RECOMMENDED OK
(1) oil code
(2) oil classification
(1)
(2)
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