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A spark ignition type reciprocating engine of a natural intake system with an ignition plug arranged to face a combustion chamber defined and delimited by a piston inserted into a cylinder so as to move in a reciprocating way, which has: a bore size of the cylinder ranging from approximately 45 mm t

A spark ignition type reciprocating engine of a natural intake system with an ignition plug arranged to face a combustion chamber defined and delimited by a piston inserted into a cylinder so as to move in a reciprocating way, which has: a bore size of the cylinder ranging from approximately 45 mm to 67 mm; a volume of a single chamber of the cylinder ranging from approximately 110 cc to 340 cc; a ratio of a stroke of the piston to the bore size of the cylinder being larger than 1; and a compression ratio of the engine being 11 or larger.

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A spark ignition type reciprocating engine of a natural intake type system with an ignition plug disposed to face a combustion chamber defined and delimited by a piston inserted into a cylinder so as to move in a reciprocating way, further comprising: means for reducing an effective compression rati

A spark ignition type reciprocating engine of a natural intake type system with an ignition plug disposed to face a combustion chamber defined and delimited by a piston inserted into a cylinder so as to move in a reciprocating way, further comprising: means for reducing an effective compression ratio of the engine in a region where a load on the engine is relatively low so as to make the effective compression ratio lower than in a region where a load on the engine is relatively high; wherein a ratio of a stroke of the piston to a bore size of the cylinder is chosen to be larger than 1 so that knocking in the engine tends not to occur in the region where the load on the engine is relatively high; and wherein the engine has a compression ratio of at least 11.