The ideal idle RPM (revolutions per minute) for a Royal Enfield Classic 350 can vary slightly depending on the model year and specific engine tuning. However, in general, the recommended idle RPM for a Royal Enfield Classic 350 is around 1200 to 1400 RPM.
It's worth noting that the exact idle RPM can be affected by factors such as ambient temperature, engine condition, and modifications made to the motorcycle. It's always a good idea to consult the owner's manual or contact an authorized Royal Enfield service center for the most accurate information specific to your model and year. They can provide you with the manufacturer's recommended idle RPM range to ensure optimal performance and smooth operation of your motorcycle.