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Two stroke
engines simply don't live as long as four stroke engines.
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The lack of a
dedicated lubrication system means that the moving parts of a two stroke engine
wear-out faster.
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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.
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Two stroke
oil can be expensive ($60.00 a gallon.) Mixing ratio is about 4 ounces per
gallon of gas: burning about a gallon of oil every 1,000 miles. You would not
want to drive your car if it were polluting a gallon of oil in 1000 miles!
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Two stroke
engines do not use fuel efficiently, yielding fewer miles per gallon.
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Two stroke
engines create a lot more noise, requiring expensive air intake silencers and
exhaust systems to manage the noise, this is not a problem until your neighbors
start to point it out!
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Because two
stroke engines are designed to burn their oil (instead of changing and letting
you recycle it) they produce more pollution.
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Most Aviation
two strokes require expensive aviation fuel. Using pump gas can shorten two
stroke engine life considerably.
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Two stroke
engines will require re-jetting for flying in the different seasons of the year.
Using the wrong jet can be detrimental to engine life.
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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.
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