very ezy to do yourself , change the oil , most of the small gennys don't have an oil filter .
buy it a new air filter , as these are the big let down, the foam just disintegrates and gets sucked through .
Last year up at Princess Charlotte 2 Honda's swallowed their air filters in 3 days , just lucky I had fitted a new one to mine before we left and I had the old one and a new one in its box for after the trip,with me, that got the other camp back up and running.
20h hour oil changes and they will run for years .
cheers