See also:

Recommended fluid
Refer to “Fluids”. ...

Air cleaner element
Do not operate the engine with the air cleaner element removed. The air cleaner element not only filters intake air but also stops flames if the engine backfires. If the air cleaner elem ...

Precautions against vehicle modification
To avoid accidental activation of the system or rendering the system inoperative, which may result in serious injury, no modifications should be made to any components or wiring of the S ...