No, it is not advisable to ride a motorcycle with water in the engine oil. Water in the engine oil can have serious detrimental effects on the engine's performance and can potentially cause significant damage. The engine oil serves multiple important functions, including lubrication, cooling, and cleaning. Water contamination can disrupt these functions and lead to increased friction, overheating, corrosion, and wear within the engine.
If you suspect that water has entered the engine oil, it is crucial to address the issue before attempting to ride the motorcycle. Riding with water in the engine oil can worsen the problem and result in severe engine damage. It is recommended to drain the contaminated oil, flush the engine thoroughly, and replace the oil and oil filter with fresh, uncontaminated oil.
If you are uncertain about the condition of your motorcycle's engine oil, it is best to consult a professional mechanic or technician who can properly assess and address the issue.