Other
Spark-ignition piston engines, not exceeding 50 cc, other
HSN 8407 31 90 (spark-ignition reciprocating or rotary internal combustion piston engines of a cylinder capacity not exceeding 50 cc — other) is not covered by a Bureau of Indian Standards Quality Control Order and carries no Partner Government Agency clearance requirement at the tariff-line level. Import follows the standard customs procedure: Importer-Exporter Code (IEC), bill of entry, commercial invoice, packing list. Engines of a larger cylinder capacity, or those assembled into complete vehicles or equipment, may fall under sibling tariff lines within Chapter 84 or Chapter 87 that do carry compliance obligations.
The principal risk at this tariff line is misclassification: engines intended for two-wheelers, power tillers, or generator sets are frequently re-classified by customs to a more specific heading that carries BIS or other compliance requirements. Re-classification on examination triggers retrospective compliance, including detention pending the relevant licence or certificate. Importers should confirm the engine's intended application and cylinder capacity in technical documentation before relying on the absence of compliance at this line.