Yamaha GPD N-Max
Coolant capacity & service interval
Yamaha GPD N-Max coolant capacity ranges from 0,13 to 0,46 liters. The service interval for coolant is 36 months. The data covers 4 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| N-Max 125, GPD125-A (2021- ) |
|
| N-Max 155, GPD155-A (2021- ) |
|
| N-Max 155, GPD150-A (2017-2020) |
|
| N-Max 125, GPD125-A (2015-2020) |
|
Additional Notes
- The radiator capacity of 0.46 liter is consistent across all four configurations — the N-Max 125 (GPD125-A) and N-Max 155 (GPD150-A/GPD155-A) — spanning both the 2015-2020 and 2021 onward variants. A radiator figure represents the primary circuit volume, meaning the amount of coolant held within the engine's main cooling passages and radiator core itself.
- The reservoir capacity differs between model year groups. The 2015-2020 N-Max 125 and 2017-2020 N-Max 155 both specify a 0.25 liter reservoir, while the 2021 onward variants of both the 125 and 155 specify a reduced 0.13 liter reservoir. The reservoir holds overflow coolant that returns to the radiator as the system cools, so a smaller reservoir volume reflects a reduced overflow buffer in the revised design.
- The reduction in reservoir capacity from 0.25 liter to 0.13 liter between the pre-2021 and 2021 onward variants applies equally to both the 125 cc and 155 cc configurations, indicating a shared design change across the range at that model year boundary.
- All four configurations share a 36-month coolant change interval under normal use conditions. A time-based interval of this type reflects the degradation of corrosion inhibitors and pH stability in the coolant fluid over time, independent of mileage accumulation.
- The N-Max 155 GPD150-A entered the specifications from 2017, while the N-Max 125 GPD125-A specifications begin from 2015, placing the 155 cc variant two years later in the covered range for the pre-2021 generation.