The 150 RR uses a foam element. Clean it with kerosene, dry it, and lightly coat it with fresh oil. A clogged filter will make the bike run rich and foul spark plugs. Essential Specifications Quick-Reference Specification (Approximate) Idle Speed 1,300 ± 50 RPM Transmission Oil SAE 10W-30 or 10W-40 (API SE, SF, or SG) Brake Fluid Tire Pressure Front: 25-28 psi / Rear: 28-32 psi for a specific task, such as cleaning the KIPS tuning the carburetor