<Li> replacing the lower shaft with a hedge trimmer . </Li> <Li> replacing the lower shaft with a cultivator . </Li> <P> Quick - release shafts are offered on many newer models which do not require any tools to switch in accessories . </P> <P> Gasoline - engine powered trimmers usually have a minimum of 21 cc displacement motors . At this size they can easily turn 2 - millimetre (0.079 in) line and some have nylon blades as accessories to the line - reel . A 32 cc engine can swing a 2.75 mm (0.108 in) line and often has metal - blade accessories . Most trimmers use two stroke engines and require gasoline mixed with oil . Due to pollution laws four stroke engines are becoming more popular with a number of commercial weed eater models now being powered by four stroke engines . For instance, Honda, MTD and Craftsman manufacture a four stroke engine trimmer . Other companies, such as John Deere, now carry low - emission two - stroke engine trimmers . Stihl manufactures a hybrid four stroke engine trimmer using a technology called 4MIX . 4MIX trimmers have no oil reservoir . This engine is lubricated using pre-mixed gasoline, like a two - stroke engine . </P>

What does cc mean on a weed eater