For a Bajaj Pulsar NS200 with an engine compression ratio of 11:1, it is generally recommended to use fuel with a higher octane rating to prevent knocking or detonation. In this case, it would be preferable to use a fuel with an octane rating of 91 or higher.
Using unleaded petrol with an octane rating of 87, which is lower than the recommended rating, may increase the likelihood of knocking or pre-ignition. Knocking can lead to engine damage and reduced performance over time.
By using fuel with a higher octane rating like 91, you provide better resistance to knocking and ensure that the engine operates within its optimal parameters. This can help minimize engine wear and tear, leading to improved performance and longevity.
It's important to note that octane ratings may vary in different regions, so it's advisable to check the fuel specifications provided by the manufacturer or consult the owner's manual for the recommended octane rating for your specific model and region.
In summary, using unleaded petrol with an octane rating of 91 or higher is generally preferable for a Bajaj Pulsar NS200 with an engine compression ratio of 11:1 to minimize engine tear and maintain optimal performance.