Harley-Davidson Sportster, Nightster, RH

Coolant capacity & service interval

Harley-Davidson Sportster, Nightster, and RH models utilize coolant with a capacity range of 2,1 to 2,2 liters. The service interval for coolant replacement is 48000 km. The data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Nightster Special 975, ZF (2023- )
  • Use: Normal
  • Capacity 2,1 liter (approximately)
  • Change 48000 km
Nightster 975, ZH (2022- )
  • Use: Normal
  • Capacity 2,1 liter (approximately)
  • Change 48000 km
Sportster S 1250, ZC (2021- )
  • Use: Normal
  • Capacity 2,2 liter (approximately)
  • Change 48000 km

Additional Notes

  • The Harley-Davidson Sportster S 1250, ZC carries a cooling system capacity of approximately 2.2 liters, while both the Nightster 975, ZH and the Nightster Special 975, ZF share a slightly lower capacity of approximately 2.1 liters.
  • The "approximately" qualifier on all three capacity figures indicates these are nominal fill volumes rather than precise measured overhaul capacities, meaning actual system fill may vary slightly depending on residual fluid and bleeding procedure.
  • All three configurations share an identical coolant change interval of 48,000 km under normal use conditions, applied consistently across the 975 cc and 1250 cc engine variants.
  • The Nightster 975, ZH has a starting year of 2022, while the Sportster S 1250, ZC carries a starting year of 2021, placing the Sportster S as the earlier introduction among the three listed models.
  • The Nightster Special 975, ZF shares both the 2.1-liter capacity and the 48,000 km interval with the standard Nightster 975, ZH, despite being a separate trim designation with a starting year of 2023.