If Uneven tire wear or a damaged tire could also cause wobbling.
Wheel alignment: Misaligned wheels can lead to instability and wobbling. Ensure that the rear wheel is correctly aligned and properly tightened.
Suspension issues: Faulty or worn-out suspension components, such as shock absorbers or swingarm bushings, may contribute to the wobbling sensation. Have these components inspected for any signs of damage or wear.
Loose or damaged parts: Check if any bolts, nuts, or other crucial components in the rear end assembly are loose or damaged. Vibrations and movement can occur if these parts are not properly secured.
Chain tension: Improper chain tension can affect the stability of your motorcycle. Make sure the chain is properly adjusted according to the manufacturer's specifications.
Since your motorcycle is only a year old and has completed a relatively low mileage of 4,000 kilometers, it is possible that the issue might be minor or related to a simple adjustment. However, it's crucial to address the wobbling promptly to prevent any potential safety hazards. Contact an authorized service center or a trusted motorcycle mechanic who specializes in Royal Enfield bikes to diagnose and rectify the problem. They will have the expertise to identify the specific cause and recommend appropriate repairs or adjustments.