The core function of the high and low speed gears of three-wheeled motorcycles (also known as high and low speed gearboxes) is to adapt to different loads and road conditions to achieve "powerful at low speeds and fuel-saving at high speeds". The specific usage scenarios are clear and combined with daily vehicle use scenarios, and are explained in different situations, making it easy to remember and use.：

1. Low speed ( L files / low grade): The main focus is "large torque and strong power", giving priority to these three situations.

When driving with heavy load: When hauling a full load of cargo (such as building materials, food), carrying a large number of people, or the load of the cargo box is close to the upper limit of the vehicle, a low gear must be used to avoid insufficient power, engine overload, and clutch slippage.

climb / When going up a steep slope: Whether it is a steep slope in a mountainous area, a steep dirt road in a rural area, or an uphill slope in an underground garage, the low gear can provide sufficient torque to prevent the vehicle from rolling back and the engine from overheating, especially at 200°C. cc For heavy-duty vehicles, low speed must be used when climbing hills.

Start / When driving at low speed: When the vehicle starts from a standstill (especially when starting with a heavy load), or moves the vehicle at low speed on narrow roads or country roads, using low gear is more stable, less likely to stall, and the control is more flexible.

2. High speed ( H files / upscale): The main focus is "high speed and fuel saving", giving priority to these two situations.

No load / When driving on flat road with light load: No cargo, only passengers (1-2 people), or a small amount of light cargo (300 kg (within), on national highways, rural flat roads and other sections with better road conditions, use high gear to drive faster and have more balanced fuel consumption (more fuel efficient than low gear).

When cruising at a constant speed: The driving speed on flat road is stable (such as 30-50 km/h）, There are no frequent starts and stops, no steep slopes, switching to high gears, reducing engine speed, reducing fuel consumption, and reducing engine wear.

Key reminders (key points to avoid pitfalls)

It is prohibited to drive at low speed and high speed: It will cause the engine speed to be too high, overheat, and fuel consumption to soar. If this happens for a long time, it will wear the engine and clutch.

Disable high-speed reloading / climb: It will cause insufficient power, vehicle sluggishness, even clutch slippage, rear axle damage, and in severe cases, safety hazards.

switch gears: It is necessary to switch when the vehicle is stationary or at low speed and constant speed, and avoid forced switching when driving at high speed to prevent gear damage.