Replace the spark plug, air filter, fuel filter where applicable. Replace the fuel hoses if necessary. Drain and refill fuel tank / oil tank. Sharpen chainsaw chain / replace trimmer line. Grease the gear head where applicable. Inspect unit for damage, wear, scoring, or burning. Check and set carburetor to factory standards. Start and run machine, test engine speed and output power. You can expect to pay $30 for this service.