CN code 840734 covers reciprocating piston internal combustion engines of the spark-ignition type with a cylinder capacity exceeding 1000 cc, intended for applications other than the propulsion of vehicles of Chapter 87 CN. This subheading includes outboard and inboard engines for motorboats and yachts, engines for high-capacity power generators, engines for construction and agricultural machinery not subject to road registration, and engines for special vehicles not classified in Chapter 87. Classification under 840734 rather than 840733 depends on the intended application as specified by the manufacturer. A structurally identical engine may be classified under different subheadings depending on its declared use. Importers should hold technical documentation confirming the engine's intended application. The General Rules for the Interpretation of the CN, particularly rules 1 and 6, form the basis for classification. For universal engines that may be used in both vehicles and other machinery, the application stated by the manufacturer is determinative. Where doubt exists, a Binding Tariff Information ruling should be sought from the competent customs authority.

Importing engines under subheading 840734 into the EU requires compliance with the Union Customs Code and technical regulations specific to the intended application. Engines for boats are subject to the Recreational Craft Directive (Directive 2013/53/EU), which establishes requirements for exhaust emissions and noise. Engines for non-road mobile machinery are covered by the NRMM Regulation (EU) 2016/1628 regarding emission limits. The Machinery Regulation (EU) 2023/1230 applies to engines forming part of machinery placed on the EU market. Importers must hold an EORI number and submit a customs declaration with CN code 840734. Documentation includes a commercial invoice, transport document, and technical specification covering cylinder capacity, power output, emission standard and declared application. Chemical substances in engine components may be subject to REACH. MFN and preferential duty rates should be verified in TARIC. Imports of marine engines from Asian countries represent a significant share of the EU market. Preferential rates under EU FTAs may apply subject to rules of origin.

Engines classified under subheading 840734 are widely used in the marine and industrial sectors. Marine applications include outboard engines of 1000-6200 cc capacity from leading Japanese and American manufacturers, inboard engines for motor yachts, and engines for pontoon boats and workboats. In the industrial sector, these engines power standby and emergency generators rated from tens to hundreds of kilowatts, flood and dewatering pumps, portable compressors, and earthmoving equipment. Gas engines running on LPG or CNG used in forklifts and indoor industrial vehicles are also classified under this subheading, provided they operate on the spark-ignition principle. The market for non-road engines in the EU is subject to environmental regulations limiting harmful emissions. Engines that fail to meet emission requirements cannot be legally placed on the EU market. Importers should verify that the engine holds the appropriate certificate of conformity with the EU emission standards applicable to its intended use. Marine engines represent a significant import category from North America and East Asia.