Hi Sam,
The very initial lot of Classic 500 were all suffering from this problem, because of which RE came up with a second Map for the ECU. There could a few things you can start with. A) Put a new air filter. B) Change your main plug to NGK BPR6ES, 3) And if these do not address your problem, reflash your ECU, for which you will have to coordinate with RSM at your dealership. I assume this will definitely help you. Keep us updated. Thanks for writing to WeRoyal Riders Club Agra.