It is generally recommended to follow the manufacturer's guidelines for the first service of a motorcycle. In the case of the Royal Enfield Classic 350, the recommended first service interval may vary depending on the specific model and the recommendations of the manufacturer.
While I don't have the exact specifications for the "Reborn" variant of the Classic 350, traditionally, Royal Enfield motorcycles have had a first service interval around 500 to 800 kilometers or 300 to 500 miles. This initial service is important to ensure that the motorcycle is properly inspected, adjusted, and any necessary adjustments or maintenance tasks are performed. It helps in optimizing the performance, reliability, and longevity of the motorcycle.
To be certain about the recommended first service interval for the Classic 350 Reborn, I would suggest consulting the owner's manual provided by Royal Enfield or reaching out to an authorized Royal Enfield service center. They will be able to provide you with accurate information based on the specific model and any updates or changes in the manufacturer's recommendations.
It's generally a good practice to adhere to the manufacturer's recommended service intervals to maintain the warranty coverage and keep the motorcycle in optimal condition.