Rider deaths in motorcycle racing

Columns: Year | Rider | Circuit | Race
1983 | Kunio Katsumata | Suzuka | Suzuka 8 Hours | 1985 | Dominique Litaudon | Bugatti | 24 Hours of Le Mans | 1985 | Nickolaus Ruck | Montjuïc | 24 Horas de Montjuïc | 1985 | Jean-Pierre Haemisch | Spa-Francorchamps | 24 Hours of Liège | 1985 | Harald Layher | Spa-Francorchamps | 24 Hours of Liège | 1986 | Erwin Loichinger | Hockenheim | 1000 km Hockenheim

Example questions:
In what year was there a motorcycle death at the circuit that hosts the German Grand Prix ? | When was an F1 race last held on the circuit to see the most motorcycle deaths ? | Who operates the circuit that hosts a motorcycle race to take place over eight consecutive hours ? | What motorcycle race is held at the circuit that was shortened due to safety concerns in 1979 ? | How long is the circuit that caused a motorcycle racing death in 1972 ?

Answers:
1986 | 1975 | Mobilityland Corporation | 24 Hours of Liège | 4.011 km