This tune-up kit is specifically designed for the Onan RV generator model KY 4000, Spec A-R. It includes everything you need to keep your generator running smoothly, from spark plugs to air filter. With this kit, you can ensure your generator is in top shape before your next camping trip or power outage. It is made in the USA and is compatible with various vehicle models. Get back to enjoying your outdoor adventures with confidence in your generator's performance.