(1) Motorcycle performance
1> power. Is the power of the engine. The vehicle's top speed, acceleration and hill climbing performance indicators to evaluate.
2> Economy. Generally, it is evaluated by the fuel consumption of 100 kilometers when the motorcycle is driven at an economic speed. The fuel consumption of 50-70 cc motorcycles is 1-2 liters per 100 km. 100-125 cc motorcycles have a fuel consumption of 2-2.5 liters/100 km. The fuel consumption of 125-250 ml motorcycles is 2.5-3 liters/100 km.
3> Reliability. It is expressed by the mileage without failure and the mileage without failure of major components. One of the important things is whether the brake is flexible and reliable, whether the motorcycle idling speed is stable, whether the lights Loudspeaker, indicating whether the instrument is complete and effective.
4> durability. It refers to the service life of the vehicle, which is expressed in terms of the number of miles traveled before the first overhaul.
5>Comfort and ** long flexibility, mainly refers to whether the shock absorption performance is good, whether the ride is comfortable, whether the ** long parts of the layout is reasonable, appropriate, ** long is simple and flexible.
6> traveling speed, is according to the road conditions of the driver's quality needs to be frequently used driving speed. 50 cc motorcycle driving speed is less than 50 km / h. 70-125 cc motorcycle driving speed is less than 50 km / h. 70-125 cc motorcycles have a travel speed of 50-60 km/hour. Motorcycles over 250 cc have a speed of more than 60 km/h.
7> Noise and pollution. If you want less noise and pollution, use a four-stroke engine, or separate lubrication two-stroke engine.
(2) The main purpose
1> used as a means of transportation to and from work, you can choose a 50-125 ml motorcycle. The specific displacement of the motorcycle should also be determined according to the quality and age of the driver
2>For long-distance travel or two-person riding, 125-250 cc motorcycles.
3>For transportation, 125-750 cc motorcycles with front and rear racks or cargo boxes should be chosen.
(3) Use of the environment
The choice of motorcycle should also take into account the use of the environment, and focus.
1> traveling road conditions. Motorcycle driving on a flat asphalt road when the load is minimal; driving on dirt roads, the load is relatively 1-2 times; driving on clay or sandy beaches, the load is increased by 3-5 times; in the hill climbing, the load increases even more. Therefore, when choosing a motorcycle, it is necessary to determine the displacement of the motorcycle according to the road conditions. If you often drive on flat asphalt roads, you can use 50-125 cc motorcycles. In addition, imported motorcycles are very suitable for traveling on flat asphalt roads, and 125-175 cc motorcycles can be used for traveling on dirt roads. On mountain roads, you can use 175-250 cc motorcycles.
2> Fuel supply conditions. At present, except for the former Soviet Union and some countries in Eastern Europe motorcycles use the same fuel as our country, the rest of the countries use the same fuel as our country is not the same as the motorcycle (mostly use gasoline). If you are forced to use a non-compliant fuel, it will not only affect the power of the vehicle under normal play, but also cause some parts of the wear and tear.
(4) Modeling structure
1> women, the elderly should choose a beautiful appearance, ** easy to do, the speed of the moped lower.
2>The young and strong male comrades should choose the majestic shape, has a higher speed and larger displacement of the sport motorcycle.
3> often in the bumpy road driving, or want to have a better comfort motorcycle, can choose frame stiffness, spring hydraulic two-way action type shock absorber motorcycle, and the wheel diameter should be greater than 500 mm.
4> often in the mud on the road, in order to brake the reliable available hydraulic disc brake motorcycle, and the wheel diameter is greater than 500 mm.
(5) motorcycle factory brand
China's motorcycle industry started late, the production scale of various manufacturers, technology, the amount of countries, the level of manufacturing are different, in addition, the after-sales service and supply of spare parts and so on are not the same, therefore, in the selection of models, you should learn more about the user feedback, and then decide to choose the brand and model.
(6) Economic conditions
When you decide to choose a model, you should also consider your own financial ability, because the purchase of a motorcycle is not a one-time expense, but a recurring expense. When the above aspects of the situation, to determine the model of the motorcycle, the next task is to pick a better quality motorcycle, the general selection steps are:
(1) appearance check
Motorcycle paint is bright. Uniformity, paint quality how; electroplating parts surface is bright, there is no exposed damage or spots, welded parts interface is smooth; machined parts surface is smooth; all parts of the vehicle is complete and undamaged; front and rear shock absorbers are correct; body is straight; front and rear wheels are Saga, before and after the wheel axle or bearings are not damaged; a variety of spare parts, tools, instruction manuals, maintenance manuals and certificates of conformity are complete. complete.
(2) Engine Inspection
When all the preparatory work is completed, the engine should be able to start quickly and reliably, and the cold start time should be no more than 15 seconds (excluding the auxiliary time), and the foot should not be stepped on more than 3 times at room temperature. After starting, the engine should be run at medium or low speed for 30 minutes, all parts of the engine should not be hot, idling speed should be stable without abnormal noise, when loaded, the engine should be able to run flat, and the maximum running speed should be able to exceed the rated speed when measured by a tachometer. When the engine is warmed up, in the engine idle state, hard throttle, the engine speed should be increased.
(3) test ride inspection
In conditions permitting, the buyer in addition to the above steps to check, but also in the road test ride for a distance, focusing on checking; transmission and transmission parts of the sound is normal; whether the engine is overheated, the power transmission is smooth, reliable; from the full device separation is complete, no drag. Whether the combination is smooth and reliable; whether the gear lever is flexible, no stagnation and gear loss phenomenon; steering handle ** longitudinal is a bundle of lightweight, flexible, accurate; whether the brake is reliable, no noise; throttle cable and various switches are flexible and effective; whether the motorcycle is immediately shut down after closing the power supply, whether there is leakage of oil and gas in the fuel tank and the engine; whether there is excessive bumps in the vehicle when driving.
(4) Performance Test
1> Power Performance Test. During the test ride, suddenly increase the throttle, observe whether the speed of the motorcycle increases, and whether the driver has an obvious feeling of leaning back.
2> Braking performance test. Stabilize the speed at 20km/h, and when the front wheel presses the test line, quickly reduce the throttle to the minimum, and at the same time make the front and rear wheels emergency braking, visually check whether the braking distance is more than 4 meters, and whether there is any trace of wheel drag marks on the ground.
The break-in period for new bikes (traditional method)
The performance of a motorcycle depends on the manufacturer's design and the quality of its components. With these prerequisites in place, the break-in period of a new bike can also have a significant impact on the performance of the bike in the future. The following content contains many newbies often ask questions, it is recommended that before buying a new car on the road, take a look here, there may be the answer you want.
Q: Why does a new car need to be broken in?
A: 1, in the first few hundred kilometers of driving, the engine within the parts between the contact surface is not yet completely good.
2, the break-in is conducive to the good generation of the fit gap between the metal surfaces, the engine life is greatly affected.
Q: What are the speed requirements during the break-in period?
A: About the break-in period speed recommendations:
1, 200km kilometers within the maximum speed of 40km.
2, 200km-800km maximum speed of 60km, 800km after the occasional high speed (do not last too long).
3, more than 1000km can be normal driving.
4, the break-in period avoid long fixed-speed driving (high and low speed fixed-speed driving can not), please often change the speed.
5, develop the habit of operating the throttle smoothly, that is to say, don't suddenly increase the speed and pull the throttle hard.
Q: How long is the break-in period?
A: the general instructions written on the 1000km, in fact, the complete break-in should be 3000km later, and the best period of the car is 6000km - 16000km.
Q: What are the characteristics of the oil used during the break-in period?
A: diligent change! 300km, 600km, 1000km oil change, that is, we often say: break-in period for three oil changes. The purpose is to make the micro-flakes generated by the break-in discharged. After 1000km, you can change the oil according to the normal mileage, generally mineral oil is 1000km a change.
Q: I have a four-stroke pedal, what kind of oil should I choose?
A: As long as the oil is genuine SF grade and above, it is fine. It is recommended to use SG grade, SG or above oil. The viscosity depends on the local temperature, generally you can choose 10W40, 10W30 in winter and 20W40, 20W50 in summer. Brands can be considered Castrol, BP, Shell, Mobil, Unity, Kunlun and so on .......
Q: How often is gear oil replaced?
A: You can change it once at 1000km and then every 5000km or 6 months.
Q: Can I take someone with me during the break-in period?
A: Light load is better for engine break-in. Of course, if you want to take a girl, there is no way, only to aggravate the car. But if you take a Shandong big man or a big fat man, it is not very good to control the load during the break-in period of the car's maximum load of 1/2 or less, and choose a flat and good road driving.
Q: The break-in period before driving to warm up, right?
A: Yes, it is important. In fact, after the break-in period for the car, but also to warm up, so that the temperature of the engine parts warming, oil lubrication to the surface before driving. Generally, 2 or 3 minutes in summer and 5 minutes in winter. You can do this on your own, no need to be dogmatic.
Q: How long can I drive continuously during the break-in period? What should I pay attention to?
A: forced air-cooled 125 scooter, break-in period of a driving time is best not more than 1 hour, pay attention to stop and rest, let the engine cool. Be careful not to drive for a long time to avoid overheating of the engine, not up to the break-in effect. The water-cooled ones are better and can run longer.
Q: What kind of maintenance should be done on a motorcycle in general?
A: Two oils and one filter are important. Diligent oil change is a sure way to extend the life of the cylinder, piston and piston ring. Change gear oil regularly. Regular replacement of the air filter element to maintain good combustion is a sure way to reduce engine carbon deposits and carburetor failure. Check spark plug combustion regularly. Check tire pressure regularly for driving safety. The fact that you can change the oil, air filter, and remove the spark plugs yourself is a must-have skill for a rider! A novice should learn this on his own as soon as possible after asking someone else to change it twice.
Q: What grade of gasoline should I use in my car?
A: add what grade of gasoline: one is to look at the engine compression ratio, the second is to read the manual. Some cars have high compression ratios, but the manual may suggest not to use 98 # high grade gasoline, which is related to the materials used in its engine parts. So, the general situation is to look at the compression ratio, individual cases will be written in the manual. For models with compression ratios below 9:1, use 90#. For models with compression ratios above 9:1, use 93#. For models with a compression ratio of 10:1 or more, use 97#.
Q: My new car idle speed is low and unstable, how to adjust?
A: 1, adjust the idle speed should be done when the car is warmed up. Usually run three or five kilometers to warm up.
2, 125 scooter idle speed is generally around 1700 rpm. Some are 1500 rpm. Please see the manual.
3, clockwise twist the idle dowel, rise. Counterclockwise lowers it.
Q: I used to use Unified Magnetic Protection oil, now I am going to use BP300, is it necessary to clean the engine first when I change the oil?
A: It is not necessary. Theoretically, it would be better to clean the engine and then change it, but I don't think it's necessary. Why? Some people say that you can use diesel fuel, or you can use Castrol special engine cleaning oil. But if you use them, what do you use to clean these oils? Do you believe you can absolutely drain them?
So, my personal opinion: drain the old oil in a hot car, wait a few more minutes for the old oil to drain cleaner. Then just add new oil. If you are not sure, you can change the oil at 800km. If you use the same kind of oil in the future, you can replace it according to the normal replacement period (1000km for ordinary mineral oil).