www.fzrphotography.com Over the years, it’s amazing how many engines I’ve seen destroyed by poor air filter maintenance. If you use foam or K&N style air filters, keep them clean and properly oiled. Never use aerosol foam filter oils on your foam filters! Bag them with liquid foam filter oil. Here is a quick Yamaha instruction video www.yamaha-motor.com I threw-in a quick clip at the end of a LT-Z400 that the customer was complaining on squeaking rear brakes. Can you guess why?