| Quick Specs: Honda NHX 110 LEAD (JF19) | |
|---|---|
| Production Years | 2008-2013 |
| Engine Oil | SAE 10W-30 JASO MB (0.7 L) |
| Tires (Front/Rear) | 90/90-12 44J / 100/90-10 56J |
| Spark Plug | NGK CPR7EA-9 (0.8–0.9 mm gap) |
| Battery | YTZ7S |
A unique engineering highlight of the Honda NHX 110 LEAD (JF19) is its introduction of a liquid-cooled, fuel-injected (PGM-FI) engine into a compact commuter chassis—a configuration usually reserved for larger displacement maxi-scooters. This design choice provided the JF19 with unprecedented thermal stability and fuel efficiency during the stop-and-go stresses of dense urban environments, setting a new benchmark for the 110cc class.
Engineering Overview
The JF19 platform represents Honda’s commitment to durability and low emissions. By utilizing a liquid-cooling system, Honda engineers were able to maintain tighter tolerances within the cylinder, resulting in a quieter engine with a longer service life compared to its air-cooled predecessors. The PGM-FI system ensures crisp throttle response and reliable starting in all weather conditions, making it a favorite for year-round commuters.
Maintenance Specifications
Lubrication System
For optimal performance, the JF19 requires SAE 10W-30 engine oil. It is critical to use oil meeting the JASO MB standard, which is specifically designed for scooters with dry clutches. The total capacity for an oil change is 0.7 liters. Using JASO MA oil (designed for wet clutches) may result in decreased fuel efficiency due to higher friction modifiers.
Ignition & Electrical
The ignition system relies on an NGK CPR7EA-9 spark plug. To maintain combustion efficiency, the electrode gap must be precisely set between 0.8 and 0.9 mm. Electrical reliability is anchored by the YTZ7S battery, a compact yet high-output unit capable of supporting the fuel injection system’s initial priming and the starter motor under cold conditions.
Chassis & Handling
The JF19 utilizes a staggered wheel setup (12-inch front, 10-inch rear) to balance high-speed stability with low-speed agility. Proper tire maintenance is vital for safety:
- Front Tire (90/90-12): Maintain 1.75 bar (25 psi).
- Rear Tire (100/90-10): Maintain 2.00 bar (29 psi) for solo riding, increasing to 2.25 bar (33 psi) when carrying a pillion passenger.
MotoSpecsLab Verdict
The Honda NHX 110 LEAD – JF19 remains a masterclass in urban mobility engineering. Its blend of liquid-cooling and fuel injection offers a level of sophistication rarely seen in this displacement bracket. Following the prescribed maintenance schedule—particularly regarding JASO MB oil and precise tire pressures—is essential to preserving its legendary Honda reliability.
Frequently Asked Questions
Q: Can I use 10W-40 oil?
A: While 10W-40 can be used in warmer climates, Honda specifically recommends 10W-30 for the JF19 to achieve the best balance of lubrication and fuel economy.
Q: How often should I check the spark plug gap?
A: We recommend inspecting the NGK CPR7EA-9 every 4,000 km to ensure the 0.8–0.9 mm gap remains within spec for optimal fuel atomization.