Yamaha TZ

Coolant capacity & service interval

The Yamaha TZ coolant specifications cover capacities ranging from 0.53 liter to 1.6 liter depending on configuration. The data includes coolant capacities for both radiator and total system volumes. Seven configurations are covered in the data.

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

TypeSpecifications
TZ 250, 5KE3 (2002-2002)
  • Use: Normal
  • Capacity 1,4 liter (Total)
TZ 250, 5KE2 (2001-2001)
  • Use: Normal
  • Capacity 1,4 liter (Total)
TZ 125, 4JT7 (2000-2000)
  • Use: Normal
  • Capacity 0,53 liter (Radiator)
  • Capacity 0,85 liter (Total)
TZ 250, 5KE1 (2000-2000)
  • Use: Normal
  • Capacity 1,4 liter (Total)
TZ 125, 4JT6 (1999-1999)
  • Use: Normal
  • Capacity 0,53 liter (Radiator)
  • Capacity 0,85 liter (Total)
TZ 250, 4TW4 (1999-1999)
  • Use: Normal
  • Capacity 1,6 liter (Total)
TZ 125, 4JT1 (1994-1994)
  • Use: Normal
  • Capacity 0,55 liter (Radiator)
  • Capacity 0,66 liter (Total)

Additional Notes

  • The Yamaha TZ 125 4JT1 (1994) separates radiator capacity from total system capacity, with the radiator holding 0.55 liter and the full cooling system requiring 0.66 liter. The difference of 0.11 liter accounts for coolant held in hoses and any reservoir volume outside the radiator core.
  • The TZ 125 variants 4JT6 (1999) and 4JT7 (2000) share identical cooling system figures, with a radiator capacity of 0.53 liter and a total system capacity of 0.85 liter. Compared to the 1994 4JT1, the total capacity increased by 0.19 liter despite a slight reduction in radiator-only volume, suggesting a larger external circuit in the later variants.
  • The gap between radiator and total capacity is proportionally larger in the 4JT6 and 4JT7 than in the 4JT1. In the later TZ 125 variants, the volume outside the radiator represents roughly 0.32 liter, versus 0.11 liter in the 1994 model, pointing to a more extensive coolant circuit in the revised design.
  • The TZ 250 4TW4 (1999) carries a total cooling system capacity of 1.6 liters, the highest figure among all TZ 250 variants listed. No separate radiator-only figure is given for any TZ 250 configuration; only total system capacity is specified.
  • From the 4TW4 (1999) to the 5KE1 (2000), the TZ 250 total coolant capacity dropped from 1.6 liters to 1.4 liters, a reduction of 0.2 liter. The 5KE1 figure of 1.4 liters then carries forward unchanged through the 5KE2 (2001) and 5KE3 (2002), indicating a stable cooling circuit across three consecutive model years of the later 5KE series.
  • All entries across both the TZ 125 and TZ 250 are specified under normal use conditions, meaning the capacities listed apply to standard operating environments rather than any modified or severe-duty scenario.
  • The TZ 250 displacement class consistently requires roughly double the total coolant volume of the TZ 125 variants. The smallest TZ 250 total capacity (1.4 liters) still exceeds the largest TZ 125 total capacity (0.85 liter) by a significant margin, reflecting the greater thermal load of the larger engine.