A general time frame for most major motorcycle maintenance tasks is one year or 6,000 miles, whichever comes first. This includes changing engine oil and replacing the filter, changing transmission oil, and inspecting and replacing spark plugs, fuel filters and air filters as needed.
Yearly maintenance tasks also include topping off coolant and brake fluid levels and doing a full-range inspection to replace damaged or worn parts such as fuel lines, throttle cables, clutch cable, drive belt and brake pads. Most motorcycle owner manuals include detailed recommended maintenance schedules.
Every two years or 12,000 miles, motorcycles usually require replacing the brake fluid and coolant, servicing the air injection system and lubricating the steering head bearings.