# 1986 World Junior Championships in Athletics – Men's 400 metres hurdles

The men's 400 metres hurdles event at the 1986 World Junior Championships in Athletics was held in Athens, Greece, at Olympic Stadium on 16, 17 and 18 July.

## Medalists

| Gold | Emilio Valle Cuba |
| Silver | Hiroshi Kakimori Japan |
| Bronze | Pascal Maran France |

## Results
### Final

18 July
| Rank | Name | Nationality | Time |
| | Emilio Valle | Cuba | 50.02 |
| | Hiroshi Kakimori | Japan | 50.09 |
| | Pascal Maran | France | 50.39 |
| 4 | Carsten Köhrbrück | West Germany | 50.58 |
| 5 | Alain Cuypers | Belgium | 50.67 |
| 6 | Nikolay Boiko | Soviet Union | 50.87 |
| 7 | Dolph Francis | Australia | 51.69 |
| | Joseph Maritim | Kenya | DNF |

### Semifinals

17 July

#### Semifinal 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Hiroshi Kakimori | Japan | 50.05 | Q |
| 2 | Emilio Valle | Cuba | 50.39 | Q |
| 3 | Alain Cuypers | Belgium | 50.51 | Q |
| 4 | Nikolay Boiko | Soviet Union | 50.57 | Q |
| 5 | Stéphane Leger | France | 51.90 | |
| 6 | Andrzej Nowak | Poland | 52.38 | |
| 7 | Kevin Mason | United States | 53.17 | |
| | Valeriy Kosobokov | Soviet Union | DNS | |

#### Semifinal 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Joseph Maritim | Kenya | 50.27 | Q |
| 2 | Dolph Francis | Australia | 50.72 | Q |
| 3 | Pascal Maran | France | 50.99 | Q |
| 4 | Carsten Köhrbrück | West Germany | 51.12 | Q |
| 5 | Róbert Bágyi | Hungary | 51.23 | |
| 6 | Philip Hughes | Canada | 52.38 | |
| 7 | Michael Graham | United States | 53.22 | |
| | Herwig Röttl | Austria | DNS | |

### Heats

16 July

#### Heat 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Joseph Maritim | Kenya | 50.70 | Q |
| 2 | Alain Cuypers | Belgium | 51.29 | Q |
| 3 | Stéphane Leger | France | 52.28 | Q |
| 4 | Constantin Popescu | Romania | 52.64 | |
| 5 | Gianni Floridia | Italy | 53.02 | |
| 6 | Jorge Guevara | Mexico | 54.78 | |
| 7 | Yasser Abdulrahman Fallatah Kadhy | Saudi Arabia | 57.30 | |

#### Heat 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Pascal Maran | France | 51.12 | Q |
| 2 | Carsten Köhrbrück | West Germany | 51.48 | Q |
| 3 | Róbert Bágyi | Hungary | 51.62 | Q |
| 4 | Dolph Francis | Australia | 52.01 | q |
| 5 | Takahiro Matsuhisa | Japan | 52.89 | |
| 6 | Khaled Abdullah Hassan | Bahrain | 52.99 | |
| 7 | Daniel Velázquez | Puerto Rico | 53.85 | |

#### Heat 3

| Rank | Name | Nationality | Time | Notes |
| 1 | Kevin Mason | United States | 51.90 | Q |
| 2 | Nikolay Boiko | Soviet Union | 52.20 | Q |
| 3 | Herwig Röttl | Austria | 52.29 | Q |
| 4 | Antonio Smith | Venezuela | 52.42 | |
| 5 | Emil Peshev | Bulgaria | 52.48 | |
| 6 | Yehuda Moreli | Israel | 53.96 | |
| 7 | Stelios Bisbas | Greece | 55.30 | |

#### Heat 4

| Rank | Name | Nationality | Time | Notes |
| 1 | Hiroshi Kakimori | Japan | 50.61 | Q |
| 2 | Emilio Valle | Cuba | 51.12 | Q |
| 3 | Philip Hughes | Canada | 52.41 | Q |
| 4 | Pel van de Kerkhof | Netherlands | 53.19 | |
| 5 | Mark Langmuir | Australia | 53.41 | |
| 6 | Oliver Ciesla | West Germany | 55.12 | |
| 7 | Roberto Mobarec | Bolivia | 56.15 | |
| 8 | Vasilios Archondidis | Greece | 56.38 | |

#### Heat 5

| Rank | Name | Nationality | Time | Notes |
| 1 | Andrzej Nowak | Poland | 51.93 | Q |
| 2 | Valeriy Kosobokov | Soviet Union | 52.04 | Q |
| 3 | Michael Graham | United States | 52.14 | Q |
| 4 | Michele Carrozza | Italy | 52.60 | |
| 5 | Allan Ince | Barbados | 52.63 | |
| 6 | Augustus Lawson | Ghana | 54.66 | |
| 7 | Ralph Carter | Canada | 54.73 | |
| 8 | Tarek Khamis Dabouss | United Arab Emirates | 59.14 | |

## Participation

According to an unofficial count, 37 athletes from 28 countries participated in the event.
* Australia (2)
* Austria (1)
* Bahrain (1)
* Barbados (1)
* Belgium (1)
* Bolivia (1)
* Bulgaria (1)
* Canada (2)
* Cuba (1)
* France (2)
* Ghana (1)
* Greece (2)
* Hungary (1)
* Israel (1)
* Italy (2)
* Japan (2)
* Kenya (1)
* Mexico (1)
* Netherlands (1)
* Poland (1)
* Puerto Rico (1)
* Romania (1)
* Saudi Arabia (1)
* Soviet Union (2)
* United Arab Emirates (1)
* United States (2)
* Venezuela (1)
* West Germany (2)