Huzhou Daixi Zhenhua Corporation (HDZ), a private company

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Tool Cart

Huzhou Daixi Zhenhua Corporation (HDZ), a private company

Rv Products

Rv Products

Huzhou Daixi Zhenhua Corporation (HDZ), a private company

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  • Motorcycle
  • Manual Tool Cart
  • Electric Tool Cart
  • RV Products
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Welcome to
Huzhou Daixi Zhenhua Corporation

Motorcycle &
Tool Cart

Zhenhua Tech & Trade Co., Ltd is

China Motorcycles Suppliers,Electric Bikes and Agricultural Appliances Manufacturers

,We manufacturer variety of motorcycles,electric bikes,auto parts,garden equipments,and other products.
About us

Our company is located in 104 highway, Daixi Town, Huzhou City, Zhejiang Province, where is 1 hour away from Hangzhou, 2 hours away from Nanjing, and 2.5 hours away from Shanghai. Our company has more than 500 employees, including 76 technicians and engineers. Our factory covers an area of 110,000 square meters, with 80,000 square meters of production area. We are equipped with 400 different kinds of specific devices with strong technical development ability, and quality control ability.

  • Customization
  • Good Service
  • Multiformity
  • High Productivity

News Centre

  • Three parts of the motorcycle transmission system

    Like a variable speed bicycle, the motorcycle transmission system also has three parts: front gear, rear gear and chain. The front and rear gear ratios set by the vehicle are suitable for most ordinary knights. However, if the riding habits and styles are different from the original settings, the gear ratios of the front and rear gears can also be adjusted. Try to achieve it.

    In general, maintaining the front gear is not the only way to replace the rear sprocket is the fastest and direct method. Different riding styles, needs and habits will have different practices. Increasing the gear ratio will make the car accelerate better, but Sacrifice the tail speed of the vehicle, and vice versa, there is a better tail speed, but the acceleration of the sacrifice is fierce.

    However, the same purpose can be achieved by replacing the front gear, but we generally do not recommend this, except to avoid the fact that the front gear can not maintain a reasonable chain rotation space, and the reduction of the front gear is also likely to cause the bearing and the oil seal. Accelerated wear and tear, so it is better to start with the rear sprocket. However, keep in mind that although it only changes the gear ratio of the vehicle, it does cause the whole car to have a completely different feeling. Under the same conditions, the same throttle opening will change the speed of the car, and the same engine speed will also drive. Change, the vibration at the same speed may be bigger, etc. These are the results that may be produced after changing the gear ratio. The Cavaliers must also learn to get used to it.

    Another important thing is that when changing gears, it is also the time to check the chain. If the chain has been used for a long time, there is excessive wear and tear and rust. It is better to replace the chain at this time. There is a Pitch/pitch when you change the chainring and the chain. If it is not a competitor, you should try to maintain the original settings. The Pitch is usually set to the game demand orientation. There is a lighter weight but there is a consequence of accelerated wear.

  • Use the time to drive motorcycle more effectively

    A motorcycle has to turn, use counter steer (reverse steering), we talked a lot before, you should be no stranger, that is, including push/pull handles. To understand, the size of the force on the handlebars affects the speed at which the motorcycle enters the corner. The hard counter steer will quickly enter the corner. Gently push and pull the handlebar and the motorcycle will turn slowly. Different corners may require different techniques. The key to cornering is probably the route. The traditional drivers are accustomed to using smooth routes. Now the drivers prefer to enter the corner later, and the APEX in the corner is also bent.

    You need to enter the bend point more precisely, turn it down quickly at the bend point, and the body falls down to a precise angle. This requires a powerful and reliable counter steer operation, which is not possible with soft hands.

    The advantage of getting into the corner later is that the motorcycle needs to be down and the distance is shorter. You can use the time to drive the motorcycle more effectively, go deeper and then turn. Can improve the horizon, especially left turn. Look at a little more and then go out. But suddenly bent down, people are a little smotorcycleed. The good news is that the current tires are very strong and you have confidence in it.

    Side hang: Everyone knows that the racer likes to hang his butt and rub his knees. Do we really need it? The purpose of the side hang is to "use your body and change the center of gravity of the motorcycle" to make the body as vertical as possible.

    1. The contact area of such tires is relatively large;

    2. And the stroke of the shock absorber is shorter;

    3. The tire and the shock absorber and the body move vertically up and down, the efficiency is also relatively high, and the grip is relatively strong;

    4. The body is relatively vertical, and it is not easy to wear the body when cornering. A little safer.

  • Preheating the components of motorcycle is a necessary process

    Usually, after the motorcycle is placed for one night, the oil will return to the crankcase. The piston piston ring is basically free of oil lubrication. At this time, if the motorcycle is started immediately after starting the motorcycle, the cylinder head part lacks sufficient lubricating oil lubrication, and immediately enters the working condition. After the combustion chamber is rapidly heated, the high temperature makes a small amount of oil left in the cylinder head unable to withstand the high temperature and carbonizes and burns. It is easy to cause the piston piston ring of the middle cylinder to wear and tear, which makes the piston seal insufficient, causing the cylinder head to burn the oil, and the power is reduced. If you do not pay attention to check the oil, it may cause the oil to burn seriously and cause the cylinder to be pulled.

    The purpose of preheating is to let the oil lubricate the various parts and make the engine temperature reach the working temperature. The lubrication is the most important. When we start the engine, when the oil has not been hit from the oil pan, it will only be lubricated. The engine damages the engine, but the time is very short, about one tenth of a second. If the warm-up time is not enough, it means that the engine is not fully lubricated because the oil is not fully lubricated. Damaged, on the contrary, if the warm-up time is too long, it will take a minute or two to burn like someone, so that in addition to wasting gasoline, it will cause oil and gas to mix into the crankcase or incompletely burned gasoline to form carbon particles. It is mixed in the oil, which will accelerate the deterioration of the oil and make carbon deposits on the cylinder head, piston, and valve. After the warm-up action, drive at a speed of no more than 40km per hour for about 1km. The purpose is to let the engine reach the working temperature and keep the motorcycle at its best.

    Therefore, preheating the motorcycle is a necessary process. No matter how stable your motorcycle's idle speed is, do not use the stability of the idle speed to determine whether the motorcycle is finished. Usually the viscosity of the oil in summer is reduced. The time of the motorcycle is 2~ 3 minutes, the viscosity of the winter oil becomes larger and the time for warming up is longer, 3 to 5 minutes.

    The engine speed should be controlled between 1500-2000 rpm when the motorcycle is warming up. Especially the old motorcycle of more than 10,000 kilometers, because the oil pump inside the old motorcycle engine is worn. The idle preheating oil is not delivered to the lubricated parts.

  • The spark plug is a window of the engine

    The spark plug is a "window" of the engine. By observing the working condition of the spark plug electrode, it can be roughly judged whether the engine works normally. When the engine is working normally, the surface of the two electrodes of the spark plug is brown and clean. If the following symptoms appear on the surface of the spark plug electrode, there is some sort of malfunction in the engine. 

    1.The electrode surface is wet. It indicates that the gasoline is not completely burned. At this time, the engine tends to be unstable and it is difficult to start after the flameout. This often happens after the engine has been idling for a long time and the throttle has been slammed.

    2.The surface of the electrode has lubricating oil deposits. The performance lubricant has already entered the combustion chamber, and the reasons for this are:

    a. The cylinder, piston and piston ring wear more seriously, and even the phenomenon of "pumping oil" appears;

    b. The oil level of the oil bath type air filter is too high;

    c. The crankcase ventilation device is blocked, causing the oil to slam. If only a single spark plug has lubricating oil deposits, it may be that a cylinder valve stem oil seal fails and the lubricating oil is drawn into the cylinder from the valve stem.

    3.There is black carbon deposit between the electrodes. This is caused by the mixture being too rich or operating under low load conditions for a long time. There is carbon deposit on the spark plug, which is equivalent to a shunt resistor connected in parallel between the two electrodes, causing premature leakage and sparking or high-pressure spark.

    4.The surface of the spark plug electrode is grayish white indicating that the mixture is too lean. There are off-white deposits on the electrode surface. It is also caused by additives in gasoline, which will cause a cylinder to "lack of fire."

    5. There are water drops on the surface of the electrode. It indicates that there is moisture intrusion in the cylinder. The reason is: the water is mixed in the gasoline; the cylinder gasket is not solid or damaged; the cylinder or cylinder head has cracks, causing the cooling water to enter the cylinder and adhere to the spark plug electrode in the form of water droplets. The cleaning spark plug is preferably carried out on a spark plug cleaner. If conditions are limited, it can be soaked in kerosene, then scraped off with a non-metallic tool and finally blown dry with compressed air.