When EZGO makes a new golf cart model, they usually nail it on the head. To the point that they can ride that success for a very long time. This Marathon 2-Cycle Tune-Up Kit is an excellent indicator of just that. The effectiveness range on this unit is over 18 years and spans two different engines. You read that right; EZGO had multiple motors that all used the same essential maintenance parts. The only fundamental changes were basic as the engineers tried to re-arrange things under the seat to make them fit better. All of the primary functions stayed the same until the conversion to 4 cycles were completed. So, these vintage two-cycle carts were single cylinders. This means that they only had one piston. This is why when you get a tune-up kit for a newer cart, you will get two spark plugs, and with this one, you only get one. You also get a fuel filter and an air filter, but what good is all of that without an oil filter as well? Good thing the smarty pants down at Buggies Unlimited thought to include it.