Dirt Bike 4 Stroke Race Prep " Full Service w/out Valve Adjust" $59.95 Plus Parts. This 4 Stroke Dirt Bike service includes, Oil and Oil Filter change, Air filter clean and air box cleaning, Chain cleaning adjust and lube, Set tire pressure, check coolant level, check brake pads, lube cables and pivot points, spark plug change if needed, check spokes and condition of wheels and tires, bolt check, Visual Inspection of bike condition, and wash.