Horizons Unlimited - The HUBB - Temporary import of ATV parts for a race

Could be challenging and/or expensive to get those parts in. I recently flew into Mendoza with clutch kit, carb parts, and gaskets and was allowed to pass since I had the temporary import permit for my motorcycle in hand. That was apparently enough proof that those parts were not going to be sold, or for use in an Argentine vehicle. I know your situation is different, though, so here's some info from customs (AFIP) as a start.

Quote:

Excerpts from AFIP - Administración Federal

Qué se puede traer libre de impuestos:

Ropas y objetos de uso personal usados, así como libros, folletos, periódicos y otros artículos, nuevos o usados, que no tengan finalidad comercial, de cualquier origen, hasta un límite POR VIAS AEREA/MARITIMA- de u$s 300 por pasajero (u$s 150 para menores de 16 años), POR VIAS FLUVIAL/TERRESTRE- de u$s 150 por pasajero (u$s 75 para menores de 16 años).

Esta franquicia sólo podrá utilizarse una vez por mes.
Cuando se excedan estas franquicias, se deberá abonar un arancel equivalente al 50% del total excedido, mediante depósito bancario en una sucursal del Banco Nación.

Qué no se puede llevar ni ingresar como equipaje:

Repuestos de automotores y otros.

The first topic says you can bring goods in tax free, up to U$S300 worth, as long as you don't intend to sell them. Also limits that to once a month. States that exceeding that amount will cost you 50% of the excess value.

The second topic says you can't bring in parts for cars and "others".

This response is not definitive. Just food for thought. And it may all depend on which customs agent you draw, and what their day has been like...

Good luck at the race!