Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THEREOF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORDERS AND REPRODUCERS AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 NUCLEAR REACTORS, BOILERS, MACHINERY AND MECHANICAL APPLIANCES; PARTS THEREOF 84 07 SPARK-IGNITION RECIPROCATING OR ROTARY INTERNAL COMBUSTION PISTON ENGINES. Commodity Code Description 84 07 10 AIRCRAFT ENGINES 84 07 21 OUTBOARD MOTORS 84 07 29 OTHER MARINE PROPULSION ENGINES 84 07 31 RECIPROCATING PISTON ENGINES,FOR VEHICLES OF CH. 87, CYL. CAPACITY =< 50CC 84 07 32 RECIPROCATING PISTON ENG.,FOR VEH. OF CH. 87,CYL. CAPACITY>50CC BUT=<250CC 84 07 33 RECIPROCATING PISTON ENG., VEH. OF CH. 87,CYL. CAPACITY>250CC BUT=<1000CC 84 07 34 RECIPROCATING PISTON ENG.,FOR VEHICLES OF CH. 87. CYL. CAPACITY >1000CC 84 07 90 OTHER ENGINES