- Most four-cycle engines will generate more power than a two-cycle, simply because they have two pistons as opposed to only one. This added power will help cut the thickest, heaviest weeds, but most average trimmer users will find that a two-cycle engine has more than enough power to meet most trimming needs. Since four-cycles generate more power, they are also larger; with the extra size comes added weight, up to four pounds more than most two-cycle engines. And if you're using the trimmer all day, this extra weight will really start adding up.
- The two-cycle engines have no oil pump to distribute oil to the crankcase and piston. So, you need to use a mixed fuel to lubricate the engine. Four-cycles do away with messy mixes as they'll run on the same gas as your lawn mower or snow blower. The two-cycle engines also don't burn as cleanly as the four-cycles, as most four-cycles use a catalytic converter. But you'll need to manually lubricate the crankcase on a regular basis with the four-cycles to keep them running properly. This can be troublesome and cost more money.
- Four-cycles, because they have more power, more parts and a competitive advantage over the two-cycles, will cost more to purchase than most two-cycle engines. Repair costs for these engines will also run higher, because there are more parts that can break down. Two-cycles do require that mixed fuel, which can add to the cost of a two-cycle trimmer.
- Basic maintenance will vary little from two-cycle to four-cycle. But repairs will cost more and be more difficult on a four-cycle engine. Two-cycles were designed to keep parts at a minimum, and accessible with only a few simple tools, which any determined homeowner can find and use. While the four-cycles operate on the same principles, repairs will be slightly more complicated, so they may require a professional.
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