It is generally not recommended to deviate significantly from the manufacturer's recommended oil capacity for your motorcycle's engine. While putting 900ml of oil in a 1200ml engine may not immediately cause catastrophic problems, it can have adverse effects on the engine's performance and longevity over time.
Here are a few potential issues that may arise from underfilling the oil:
Lubrication Insufficiency: Oil is essential for lubricating the moving parts within the engine, reducing friction, and preventing excessive wear. Insufficient oil can lead to inadequate lubrication, resulting in increased friction and potential damage to critical engine components.
Overheating: Oil also helps in dissipating heat generated by the engine. Insufficient oil may compromise the engine's cooling capabilities, leading to higher operating temperatures and increased risk of overheating. Prolonged overheating can cause engine damage and reduced performance.
Reduced Oil Life: With a lower oil volume, the oil may degrade more quickly due to increased stress and heat. This can result in reduced oil life and decreased effectiveness in maintaining optimal engine performance.
Increased Wear and Tear: Insufficient oil can lead to increased wear on engine components, such as the piston rings, cylinder walls, and bearings. Over time, this can result in reduced engine performance, decreased efficiency, and potentially costly repairs.
To ensure the proper functioning and longevity of your motorcycle's engine, it is advisable to adhere to the manufacturer's recommended oil capacity. If you have concerns or uncertainties about your motorcycle's oil capacity, it's always best to consult the owner's manual or seek guidance from a qualified mechanic or the motorcycle manufacturer. They can provide specific recommendations based on your motorcycle's make and model to ensure that you are using the appropriate amount of oil for optimal performance and engine protection.