At its inception in 1897 , the two - cycle motor was ineffective to produce the same amount of index as its counterpart the four - cycle locomotive engine . As technology has evolved , so has the performance of two - cycle engines . To determine the compression of a two - cycle locomotive , take into accounting the program : The more mogul required to lam a special tool , the cracking the compression .
Lawnmowers
Because lawnmowers do not require as much magnate as orotund machine , such as automobiles and motorcycles , two - rhythm engines accommodate them . According to Samuel M. Goldwasser ’s " Compression Testing , " normal compression for a lawnmower falls between 60 and 80 pound . per straightforward inch , or pounds per square inch . A number below 60 indicates a making water or inability of the piston to compress enough air .
Weed Trimmers
locoweed trimmer joist , like lawnmowers , expect few Ezra Loomis Pound per hearty column inch to mesh than do heavier machines so they diminish into the 60 to 80 psi range . If a weed trimmer has at least 60 pound . of pressing , the railway locomotive will still start , but anything less will not create enough business leader to turn the engine over .
Boats
Two - round boat engine dissent from both lawnmower and dope trimmer joist engines because they necessitate more pressure to make more power . Boat owners who opt two - cycle over four - cycle do so because of the two - cycle per second weighs less ; many owners opt to buy two engines instead of one for more big businessman . While four - cycle gravy holder engines often require between 170 and 200 pounds per square inch , two - cycle engines ask only 80 to 140 psi . Compression figures above or below this mountain range signal a malfunction .
Compression Testers
Regular compression testing can help ensure that the air pressure story in any small two - cycle locomotive engine are up to appropriate standards . Check the compression by pulling out the twinkle plug , place the tester in the flicker plug larboard and displume the cord a few times to work up up air travel in the engine . Maintaining optimum compression can stretch forth the life of any two - cycle engine .
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