What is the use of motorcycle certificate?
For a car without an invoice, the most important thing is to confirm that the car is not a black car. If possible, you can go to the dealership where the original car was purchased, or ask the original owner to contact the dealership to issue a certificate. If this is difficult, you can sign an agreement with the seller, and the seller promises that the source of the car is legal.
If you want to resell this car in the future, you have to do this. If the car has been licensed, you can go to the traffic control department for verification, but if the car has not been licensed, it is impossible to get licensed without necessary procedures. ?
1, motorcycle certificate According to national regulations, motorcycles must be provided when they leave the factory and must be carried with the vehicle. Where the car goes, the certificate will follow.
2. A motorcycle without a certificate is a car borrowed from a bank. Only after all these vehicles are sold and the bank loan is repaid can we get the approval certificate. If the vehicle sells quickly, the certificate can be obtained quickly. If you can't sell it for several months, you won't get the certificate for several months. Cars without a certificate will not be able to go through the formalities of settlement, and naturally they will not be able to get on the road. If they buy a motorcycle, they can't drive it at home, and it is a waste to buy it.
Therefore, it is best not to buy a motorcycle without a certificate, because no one knows when to get a certificate.
Extended data:
1, characteristics of motorcycle engine:
(1) The engine is a two-stroke or four-stroke gasoline engine.
(2) Adopt air cooling, including natural air cooling and forced air cooling. The general model adopts natural air cooling, relying on the air blowing through the cylinder head and the radiator on the cylinder liner to take away the heat. In order to ensure the cooling of high-power motorcycle engine at low speed and before driving, forced air cooling is adopted, equipped with a fan and an air guide cover, and the heat sink is cooled by forced air.
(3) The engine speed is high, generally above 5000 rpm. The rising power (the effective power per liter of engine displacement) is relatively large, generally around 60kw/ liter. This shows that the motorcycle engine has a high degree of reinforcement and a small overall size.
(4) The engine crankcase, clutch and gearbox are designed as a whole with compact structure.
2, the body:
The engine block consists of three parts: cylinder head, cylinder block and crankcase. The cylinder head is made of aluminum alloy with fins. The new four-stroke motorcycle engines all adopt overhead valve, chain drive and overhead camshaft structure. The cylinder block adopts bimetal (aluminum fins cast outside the wear-resistant cast iron cylinder liner) to obtain better heat dissipation effect.
Some motorcycles use wear-resistant cast iron cylinder blocks, such as Changjiang 750 and Jialing JH70. On some small mopeds, such as Yu He YH50Q small displacement (50 cubic centimeters) engine, the inner wall of aluminum alloy cylinder is plated with 0. 15 mm hard chromium layer. Crankcase is made of aluminum alloy by die casting, and consists of left and right boxes. Some motorcycles are equipped with buffer blocks between radiating parts to suppress the noise caused by vibration of radiating fins.
3. Crank connecting rod:
The crankshaft of motorcycle engine is a combined type, which is formed by pressing a left crankshaft, a right crankshaft and a crank pin. Ball bearings are installed on the main journals of the left and right half shafts to support the crankshaft on the crankcase. Flywheel, magneto and clutch driving gear are installed at both ends of crankshaft respectively. The connecting rod has an integral structure, the big end is annular, and a needle bearing and a crank pin are installed inside to form a crank connecting rod group.
When installing a piston ring on a two-stroke engine, it is necessary to align the opening of the piston ring with the locating pin in the piston ring groove to prevent the piston ring from rotating in the ring groove, causing air leakage and scratching the intake and exhaust ports on the cylinder liner.
4. Carburetor:
Carburetor is an important part of motorcycle fuel supply system, which is located between air filter and engine intake. Motorcycle engines generally adopt carburetor, plunger throttle valve and float chamber throttle valve with horizontal intake flow direction. The carburetor structure mainly consists of a float chamber and a mixing chamber.
The float chamber is located below the carburetor, and the oil pipe is communicated with the oil tank through the throttle switch. The oil level in the float chamber is maintained at a certain height through the needle valve on the float, and the oil supply pressure is stable. The function of the mixing chamber is to evaporate and atomize gasoline and mix it with air, so that the engine can get the required mixture at various loads and speeds. It consists of throttle valve, injection needle, injection pipe, gas path and oil path.
By turning the throttle handle of motorcycle to drive the throttle steel wire to hang the rope, the throttle valve and the fuel injection needle are controlled to move up and down, and the cross section and fuel supply of the intake throat are changed to meet the needs of mixed gas at different speeds and loads. Idle speed adjusting screw is installed on one side of carburetor to adjust idle speed. Idle stop screw is used to prevent the throttle from rotating and adjust the minimum opening of the throttle. There is a return spring above the throttle to keep the throttle closed when the throttle handle is not turned.
On some two-stroke motorcycle engines, a one-way reed valve is installed between the carburetor and the cylinder block to control the air intake in order to avoid the phenomenon of back injection of the carburetor at low speed. The reed is thin spring steel, the valve seat is aluminum alloy, and there is an air inlet on it. In order to reduce the impact and vibration between the reed and the valve seat, a layer of oil glue is stuck on the contact part between the air inlet plane and the reed.
When inhaling, a certain vacuum is formed in the crankcase. Under the action of pressure difference, the reed valve opens the mixed gas and enters the crankcase. When the piston descends and the vent has not been opened, the pressure in the crankcase rises and the reed valve closes, which prevents the mixture from flowing back and improves the power and economy of the engine at low speed.
5, lubrication system:
The four-stroke engine adopts splash lubrication and pressure lubrication. Two-stroke engines generally adopt a mixed lubrication method in which a certain proportion of QB gasoline engine oil is mixed into gasoline.
However, no matter how the engine works, the mixed oil of this lubricating method is supplied with lubricating oil according to the set proportion, which increases the consumption of lubricating oil, causes incomplete combustion, more carbon deposition and exhaust pollution.
The new generation of two-stroke engines all adopt separate lubrication mode, and are equipped with separate lubricating oil tank and oil pump. The oil pump generally adopts reciprocating plunger variable oil supply pump, which is driven by crankshaft gear through worm gear. The oil supply is linked with the carburetor throttle through the throttle handle and control cable, so that the oil supply changes with the change of engine speed. There is more oil supply at high speed and reasonable oil supply at low speed, which is more fuel-efficient than mixed lubrication.
The engine oil is blown into tiny oil mist by high-speed mixed gas, which is supplied to the parts needing lubrication, so that the engine oil entering the combustion chamber is reduced, the mixed gas burns completely, and carbon deposition and exhaust pollution are reduced.
References:
Vehicle Certificate-Baidu Encyclopedia