Spark-Ignition Reciprocating Piston Engines for Vehicles, Over 250 cc to 1,000 cc

The classification within heading 840733 turns on the actual vehicle application. Motorcycle engines for road use fall under the road-vehicle lines (8407332000 series), while engines for other Chapter 87 vehicles not specifically enumerated go to the NESOI lines (8407335000, 8407336040/8407336080, or 8407339040/8407339080 depending on power output and new/used status). Binding ruling requests to CBP are advisable when the end-use is genuinely ambiguous.

CBP generally looks to manufacturer invoices, engine serial number records, hours-of-use logs, and physical inspection to determine new versus used status. For used engines (8407333040), importers should retain evidence of prior installation or operation. Misclassifying a used engine as new — or vice versa — can result in penalty exposure and post-entry correction requirements.