See Figure 3-8. The red OIL PRESSURE indicator lamp illuminates to indicate improper circulation of the engine oil. The lamp illuminates when the ignition is first turned on (before the engine is started), but should extinguish once the engine is running.
If the oil pressure indicator lamp remains lit, always check the oil supply first. If the oil supply is normal and the lamp is still lit, stop the engine at once and do not ride further until the trouble is located and the necessary repairs are made. Failure to do so may result in engine damage.
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If the indicator lamp does not extinguish, it may be caused by low oil level or diluted oil supply. In freezing weather, the oil feed and return lines can clog with ice or sludge. Other conditions that may cause the lamp to remain lit are:
• Faulty lamp wiring
• Faulty oil pressure sending unit
• Damaged oil pump
• Plugged oil filter element
• Incorrect oil viscosity for the operating temperature
• Fractured or weak spring in the oil pressure relief valve
• Incorrectly installed O-rings in the engine
To troubleshoot the problem, always check the engine oil level first. If the oil level is OK, determine if oil returns to the oil pan.
If oil does not return, shut off the engine until the problem is located and corrected.
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