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 TM 55-1905-219-14-8
4.7.10A. ENGINE - MAINTENANCE INSTRUCTIONS.
a. General.
(1) The PE-250 pump, 2 cycle air-cooled gasoline engine, is an axial fan-cooled twin cylinder engine of
the loop-scavenged third port type. It uses a mixture of gasoline, oil and air for combustion, lubrication and
cooling. It fires on every stroke for every revolution of the crankshaft.
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