| Specification | Value |
|---|---|
| Production Years | 2017–2020 |
| Engine Oil | SAE 10W-40 JASO MB (0.8 L) |
| Tires (Front/Rear) | F: 90/90-12 44J / R: 100/90-10 56J |
| Tire Pressure | F: 1.5 bar (22 psi) / R: 2.3 bar (33 psi) |
| Battery Type | YTZ7V |
| Spark Plug | NGK CR6HSA |
Engineering Highlight: The Blue Core Revolution
The Yamaha D’ELIGHT 125 (SED5) represents a significant engineering milestone for Yamaha’s urban mobility sector. It was one of the first European-market scooters to fully integrate the Blue Core engine technology. This design philosophy focuses on maximizing combustion efficiency and cooling while drastically reducing power loss through friction. A unique engineering fact of the SED5 is its remarkably low wet weight of just 99kg, achieved through a lightweight chassis design that allows it to maintain a power-to-weight ratio superior to many of its heavier competitors in the 125cc class.
Technical Analysis
The LTS125-C model utilizes a forced air-cooled, 4-stroke, SOHC, 2-valve engine optimized for Euro 4 compliance. Unlike many scooters that use JASO MA (wet clutch) oils, the D’ELIGHT 125 utilizes a dry centrifugal clutch system, necessitating the use of JASO MB lubricants. JASO MB oils are characterized by their low-friction properties, which are essential for the fuel-economy targets of the Blue Core platform.
Maintenance Guide
Lubrication System
For the SED5, oil changes are critical due to the small 0.8L reservoir. MotoSpecsLab recommends high-quality synthetic 10W-40 JASO MB oil. Always verify the level using the dipstick without screwing it back in to ensure an accurate reading.
Chassis and Safety
The staggered wheel setup (12-inch front and 10-inch rear) is designed for a balance of stability and agility. Maintaining the specific pressures of 1.5 bar (front) and 2.3 bar (rear) is vital; under-inflation on the small 10-inch rear wheel can lead to accelerated wear and compromised handling during cornering.
Electrical System
The SED5 utilizes the YTZ7V battery. This is a VRLA (Valve Regulated Lead Acid) battery. Ensure terminals are kept clean and tight, as the fuel injection system is highly sensitive to voltage drops during the start-up cycle.
Frequently Asked Questions
Q: Can I use 10W-40 JASO MA oil?
A: It is not recommended. The SED5 engine is designed for JASO MB, which offers lower friction to suit the specific internal components and fuel efficiency goals of the Blue Core engine.
Q: How often should I check the NGK CR6HSA spark plug?
A: We recommend inspection every 4,000 km and replacement every 8,000 km to ensure optimal combustion and Euro 4 emissions compliance.