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Note that the valves, normal operated by a camshaft driven off of a small gear on the crankshaft, are not drawn in their usual position for a common small (side valve) engine to improve the superb clarity of these drawings.
From ignition/magneto coil >======== || |||| Spark Plug |||| /||\ _________________________| || |________________________ | _______________________| || |______________________ | | | ==" | | | | ______ -> -> -> -> -> -> -> -> -> | | | |__ \____/ ___ -> -> -> -> -> ___ ______ __| | |____\ || / | _____________________ | \\____//____| Air-fuel || | || || | || mixture from ---> || | ||=====================|| | || carburetor ______ || / ||=====================|| \ || ______ | ____||||___ ||=====================|| ___||||____ | | | || | || | || | || | | | | || | || Piston | O || | || | | | | | || V \ || | || | | | | | || _ _ _ _ _ \ _ _ _ || | | | | | Intake | ||/ \ \|| | Exhaust | | | | Valve | | \ | | Valve | | | | Open | | \ | | Closed | | | | | | Rod \ | | | | | | | | \ | | | | \ ---> O Crank pin journal / / / O Main bearings
From ignition/magneto coil >======== || |||| Spark Plug |||| /||\ _________________________| || |________________________ | _______________________| || |______________________ | | | ==" | | | | ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ | | | |__ ______ ___ | | | | | | | | | | | ___ ______ __| | |____\\____// | _____________________ | \\____//____| || | || || | || || | ||=====================|| | || ______ || / ||=====================|| \ || ______ | ____||||___ ||=====================|| ___||||____ | | | || | || ^ || | || | | | | || | || Piston O | || | || | | | | || | || / | || | || | | | | | || _ _ _ / _ _ _ _ _ || | | | | | Intake | ||/ / \|| | Exhaust | | | | Valve | | / | | Valve | | | | Closed | | / | | Closed | | | | | | / Rod | | | | | | | | / | | | | / Crank pin journal O \ ^ \ | \ O Main bearings
ZAP! From ignition/magneto coil >======== || |||| Spark Plug |||| /||\ _________________________| || |________________________ | _______________________| || |______________________ | | | ==" | | | | - X - | | | |__ ______ ___ _____________________ ___ ______ __| | |____\\____// || || \\____//____| || | ||=====================|| | || || | ||=====================|| | || ______ || / ||=====================|| \ || ______ | ____||||___ || || ___||||____ | | | || | || Piston O || | || | | | | || | || | || | || | | | | || | || _ _ _ _ | _ _ _ _ || | || | | | | | ||/ | \|| | | | | | Intake | | | | | Exhaust | | | | Valve | | Rod | | | Valve | | | | Closed | | | | | Closed | | | | | | | | | | | ---> O | Crank pin journal | | | O Main bearings
From ignition/magneto coil >======== || |||| Spark Plug |||| /||\ _________________________| || |________________________ | _______________________| || |______________________ | | | ==" | | | | | | | | | | | | | | | | | | |__ ______ ___ V V V V V V V V V V V ___ ______ __| | |____\\____// | _____________________ | \\____//____| || | || || | || || | ||=====================|| | || ______ || / ||=====================|| \ || ______ | ____||||___ ||=====================|| ___||||____ | | | || | || | || | || | | | | || | || Piston | O || | || | | | | || | || V \ || | || | | | | | || _ _ _ _ _ \ _ _ _ || | | | | | Intake | ||/ \ \|| | Exhaust | | | | Valve | | \ | | Valve | | | | Closed | | \ | | Closed | | | | | | Rod \ | | | | | | | | \ | | | | \ O Crank pin journal / / | / | O V Main bearings
From ignition/magneto coil >======== || |||| Spark Plug |||| /||\ _________________________| || |________________________ | _______________________| || |______________________ | | | ==" | | | | -> -> -> -> -> -> -> -> -> ______ | | | |__ ______ ___ -> -> -> -> -> ___ \____/ __| | |____\\____// | _____________________ | \ || /____| || | || || | || Exhaust || | ||=====================|| | || ---> gases to ______ || / ||=====================|| \ || ______ muffler | ____||||___ ||=====================|| ___||||____ | | | || | || ^ || | || | | | | || | || Piston O | || | || | | | | || | || / | || | | | | | | || _ _ _ / _ _ _ _ _ || | | | | | Intake | ||/ / \|| | Exhaust | | | | Valve | | / | | Valve | | | | Closed | | / | | Open | | | | | | / Rod | | | | | | | | / | | | | / Crank pin journal O ---> \ \ \ O Main bearings