| Component | Specification |
|---|---|
| Engine Type | 4-Stroke, Liquid Cooled, 3-Valve |
| Production Years | 2009-2017 |
| Engine Oil | SAE 10W-40 JASO MA/MB (0.8 L) |
| Spark Plug | NGK CR7E |
| Tire Size (F/R) | 120/70-12 51L / 120/70-12 51L |
| Tire Pressure (F/R) | 1.8 bar (25 psi) / 2.0 bar (29 psi) |
| Battery Type | YTZ7S |
The Yamaha NEO’S 50 4-Takter (SA40) represents a significant milestone in urban mobility engineering. While many competitors in the 50cc class were still relying on aging two-stroke technology or basic two-valve four-stroke designs, the SA40 platform introduced a sophisticated 3-valve cylinder head. This engineering choice allowed for optimized gas flow and improved volumetric efficiency, providing a smoother power delivery and significantly lower emissions, making it one of the most environmentally conscious scooters of its era.
Engineering Overview
The SA40 generation of the NEO’S 50 is powered by a liquid-cooled, fuel-injected (in later iterations) four-stroke engine. This move toward liquid cooling was a premium feature for the 50cc segment, ensuring thermal stability during long idling periods in heavy city traffic. The chassis remains true to the NEO’S philosophy: a compact wheelbase paired with 12-inch wheels to balance agility with stability.
Maintenance Essentials
To maintain the high E-E-A-T standards of MotoSpecsLab, we emphasize following the specific fluid and ignition requirements for this model:
- Lubrication: The engine requires 0.8 liters of 10W-40 oil. Use a JASO MA/MB compliant oil to ensure compatibility with the internal components.
- Ignition: The NGK CR7E is the specific heat range required for this engine. Using a different plug can lead to carbon fouling or overheating of the combustion chamber.
- Electrical: The YTZ7S battery provides the necessary cold cranking amps (CCA) for the starter motor, which is crucial for the fuel injection system’s initial pressure prime.
Handling and Safety
The use of identical 120/70-12 tires on both the front and rear provides a neutral handling characteristic. However, maintaining the correct pressure is vital. Running below 1.8 bar in the front will significantly increase steering effort, while neglecting the 2.0 bar rear pressure can lead to premature tire wear and reduced fuel economy.
Frequently Asked Questions (FAQ)
What is the oil capacity for the SA40?
The Yamaha NEO’S 50 4-stroke (SA40) requires exactly 0.8 liters of SAE 10W-40 oil.
Which spark plug should I use?
The recommended spark plug is the NGK CR7E.
What are the tire pressures for the YN 50 4-Takter?
The front tire should be set to 1.8 bar (25 psi) and the rear to 2.0 bar (29 psi).