engine can run

engine gives maximum output

engine is most efficient

fuel can be used in a test engine without knocking

tool lean mixture

stoichiometric mixture

most economical mixture

too rich mixture

spark plug gap too small

spark plug gap too wide

vapour lock in the fuel only

incorrect fuel air mixture

gravity

the pressure created by the oil pump

splashing action of the crankshaft

none of these

oil pan

cylinder head

oil pump

separate oil tank