SOHC type internal combustion engine

摘要

An SOHC type internal combustion engine having a cam shaft for opening and closing intake and exhaust valves via rocker arms, the cam shaft being held between a cam shaft receiving wall of a cylinder head and a cam shaft holder which is secured to the cam shaft receiving wall, wherein a hole for allowing insertion of an ignition plug into a plug mounting hole is formed in the cam shaft receiving wall and opens to the surface of the wall against which a cam shaft holder abuts, and a hole for guiding a high power cord for an ignition plug is formed between the mutually abutting surfaces of the cam shaft receiving wall and the cam shaft holder.