Analysis And answer upon Typical Carburetor Malfunction
Carburetor is a accurateness mechanical device of motorcycle. But in actual use, its failure rate isn’t low. feel problem of related parts reduce the assist activity of carburetor. Such as low cleanliness, which will layer wearout of carburetor parts.
Carburetor is a precision mechanical device of motorcycle. It is as important as the heart for motorcycle engine. From a professional tapering off of view, its failure rate should be very low. But in actual use, its failure rate isn’t low.
There are two reasons:
- All the put-on of engine is aligned to carburetor, such as acceleration, transition, fuel consumption and appropriately on. when judging the irregularity of motorcycle, it is easy to combination the failure of new parts to carburetor and mistaken for carburetor deformity and replace the carburetor. For example, subsequently filter failure makes impurities clogging carburetor, the driver will usually tweak a extra carburetor fittingly as to eliminate the fault, but that doesn’t solve the fundamental problem.
- Quality burden of aligned parts reduce the sustain energy of carburetor. Such as low cleanliness, which will layer wearout of carburetor parts.
Here are analysis and answer on typical carburetor malfunction.
Starting failure:
According to the standard, if using50cc carburetor starting enriching unit correctly and begin period beyond 15 seconds after pedal or electric start, the engine can’t save continuous operation, then this is starting failure.
The cause and answer are as follows:
There is no oil inside the float bowl of carburetor
There is congestion of carburetor inlet channel. then you should follow the below step:
1.1 edit the carburetor float bowl and check whether the oil needle valve drops subsequently float drops. If the needle valve is yet contiguously amassed bearing in mind the needle valve seat, that is to say, the congestion is caused by the amalgamation bewteen needle valve and valve seat. later you can apply alcohol or acetone to clean the gasoline glue bewteen needle valve and valve seat. Such failures often happens on those motorcycle which is not used for long time. Especially considering the manufacturer of engine or motorcycle didn’t empty the oil inside float bowl of carburetor and there is as well as a long inventory or sales period, later there maybe this nice of concern and cause the failure of carburetor.
1.2 sever the float and valve, acquire fuel from the carburetor inlet and check, if there is no fuel, that is inlet congestion. subsequently you can use the compressed let breathe blower to make it clean. Beside, inlet congestion afterward means there is wealth of impurities inside the carburetor. The fundamental excuse is the filter consequently you obsession to inspect the fuel filter once cleaning the carburetor.
2.Start enriching unit failure
There is a begin enriching unit for the carburetor in view of that as to increase its starting performance, there are two main types oflawn starter enriching unit:
- Choke valve: this is a conveniently mechanical device which is usually used upon straddle type vehicle, in the same way as motorcycle CG125. You can rule its play-act by the choke blade, which will assume next the choke handle, correspondingly there won’t be many failure for this unit.
- Bypass enriching system: there are many kinds of bypass enriching system, even if electric bypass and manual bypass are the most widely used system. Electric bypass enriching system is commonly used for scooter.
The failure analysis and exclusion steps are as follows:
2.1 Four to five minutes after starting the motorcycle switch, touch the plasic shell of electric enriching valve, if you vibes the heat, that is to say, the circuit is normal. Otherwise, you need to check the circuit, if it is normal at the connect point of enriching valve, that is to say, the valve is damaged and you compulsion to correct it.
2.2 remove the start enriching valve and link up the circuit, observe the plunger goings-on of valve within five minutes, if the valve extend as soon as the spring continuously, which means the enriching valve is normal. Otherwise, the PTC heating blade is damaged and you dependence to change the valve assembly.
2.3 clean enriching channel behind compressed air.
3.Low idle speed
Low idle is as soon as the engine can begin but can not be stable after a short presidency and subsequently shut down.
Solution
Adjust plunger screw upon carburetor, screw clockwise and subsequently the engine speed will buildup even if screw counterclockwise, engine eagerness will reduce. Generally speaking, it is fine to create the engine rapidity 1500 r/min if it is a astride type car or 1700 RPM if it is a scooter.
4.Incorrect starting
There are some normal incorrect starting habit as follows:
4.1 get not use the begin enriching unit.
It is usually happened like the addict don’t know much just about this work of motorcycle. Even using this unit at room temperature, will in addition to greatly swell the starting performance.
4.2 save start enriching unit involved all the grow old during starting.
Enriching unit will find the money for strong fusion to the engine, if it is working all the time during starting, there will be too much mighty combination inside the cylinder, which will make start difficult.
Correct artifice to use begin enriching unit:
If start three or four mature and the engine yet cannot start, you craving to close the enriching unit and screw the throttle lever to rise carburetorair cylinder and later begin again.
