1. Vehicle inspection of motorcycles
First, perform an appearance inspection. The parts of the vehicle should be intact, without missing parts, and the paint layer, chrome-plated layer, and galvanized parts should be shiny and not scratched or peeled off. The vehicle should have a product certificate, product instruction manual, and check and accept the spare parts and tools provided with the vehicle according to the packing list. Then carry out the starting check. At room temperature, the cold car should not start more than three times, and the hot car should start successfully with one pedal. When the engine is running, there should be no abnormalities or knocking noises, stable idling operation, and no leakage of gasoline or engine oil.
2. Inspection and adjustment of components
(1) Front wheel braking. The front wheel brake is operated by the right hand, first check its free stroke. The so-called free stroke refers to the stroke from the beginning of the handle to the start of the brake. If the stroke is too small, the front brake shoe cannot be completely separated from the front wheel brake drum, which will affect the driving speed; if the stroke is too large, the braking efficiency cannot be braked in time.
(2) Rear wheel braking. The rear wheel brake is controlled by the foot pedal. First, check the free stroke of the brake pedal.
(3) Clutch. The clutch is generally operated by the left hand, check its free stroke when adjusting.
(4) Rear shock absorber.
(5) Rear transmission. The rear drive adjustment is mainly to check the tightness of the transmission chain (transmission belt). The inspection part is in the middle position between the front and rear sprockets (belt pulleys). Use your fingers to move the chain up and down to see the distance of the up and down movement. The range of the scooter is 10～ 20mm, ordinary motorcycles are 20-30mm. For the tightness of the triangle drive belt, press the belt by hand [press with 49 Newtons (5 kgf)], and the belt will sag by 10-20 mm.
(6) Carburetor idle speed. Idle speed is the lowest stable speed of the engine when there is no load. When the throttle handle is placed at the minimum position, the engine can keep running continuously. When adjusting, start the engine first, turn the throttle handle gradually, and check the free stroke of the throttle handle, which is generally set at 2-6 mm. If the rotation does not exceed 2 mm, the engine speed will increase, indicating that the free stroke is too small; If the stroke exceeds 6 mm and the engine speed has not increased, it means that the free stroke is too large.