The 4 Stroke Engine

  • Points to note about 2 stroke and 4 stroke engines:


  • Most Two stroke engines simply don't live as long as four stroke engines.
  • The lack of a dedicated lubrication system means that the moving parts of a two stroke engine could wear-out faster.
  • Two stroke engines require a careful mix of oil in with the gas to lubricate the crankshaft, connecting rod and cylinder walls. Getting it wrong can destroy an expensive motor in a very short period of time.
  • Two stroke oil can be expensive.  Mixing ratio is about 4 ounces per gallon of gas: simply another cost.
  • Two stroke engines do not use fuel efficiently, yielding fewer miles per gallon.
  • Two stroke engines create more noise, requiring expensive air intake silencers and exhaust systems to manage the noise, rob power and annoy neighbors!
  • Because two stroke engines are designed to burn their oil (instead of changing and letting you recycle it) they produce more pollution.
  • Most Aviation two strokes require expensive HI-Test gas or aviation fuel. Using REG pump gas can shorten two stroke engine life considerably.
  • Two stroke engines will require re-jetting for flying in the different Altitudes and some seasons of the year.  Using the wrong jet can be detrimental to engine life.

From The combustion of the oil in the gas. The oil makes all two stroke engines smoky to some extent, and a worn two stroke engine will emit more oily smoke.


  • 4 strokes use less FUEL than a 2 stroke.
  • 4 strokes use less expensive regular pump gas.  Now, some 4 strokes have fuel injection, great gas mileage.
  • 4 strokes produce less noise!
  • Engines have been engineered with longevity in mind.
  • Merlin PPC 4 strokes all have electric start for safety. Just sit in the seat turn the ignition key!
  • 4 strokes are simple with low cost maintenance.
  • Local engine parts sourcing in every town, even in national chains of "Big Box Stores".  Repairs centers everywhere in the US.


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