There are various methods to tune the carburettor of motorcycles and one generally goes to a mechanic to do it.
Here is an informative video by a motorcycle enthusiast where the carburettor of a Royal Enfield Bullet is tuned using a multimeter. Now, the use of carburettors in the engines of cars is almost obsolete these days but there are still some prominent bikes that use it. This includes the neo-retro bikes, dirt bikes or ATVs. Instead, modern bikes come with a direct fuel injection system where the fuel is directly sprayed inside the combustion cylinder. On the other hand, a carburettor is a component where the air and fuel were mixed previously before being injected into the cylinder. Fuel injection has a ton of advantages over the carburettor configurator which is why it has become more common these days.
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Carburettor of Bullet Tuned Using Multimeter
This video comes from Dhruva Mundodi on YouTube channel Mundodi Vlogs. He is an avid reader of Car Blog India and an automobile aficionado. On his channel, he keeps posting content around the restoration of vintage automobiles and aftermarket modification mechanisms. This time around, he shares a smart technique for when you want to tune the carburettor of your bike. Note that while he has demonstrated this technique on RE Bullet, it is applicable to any bike that has the carburettor.
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He sticks the multimeter, which you can get in your local market for around Rs 300, to the side of the engine using a double tape. He disconnects the wire coming out of the magnet coil wire (connector) and attaches its electrical terminals to the multimeter. The AC current of the wire depends on the RPM of the engine. Then, he starts the engine and shows that the increase in the RPM of the engine raises the voltage on the multimeter as well. By turning the idling screw, you have to increase the RPM and hence, the voltage. At around 2,000 RPM, you have to turn the air-fuel mixture screw into a fully closed position.
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Balanced Approach
Thereafter, you must slowly turn the screw in the opposite direction. As the air-fuel mixture starts to increase, the RPM goes up and the voltage goes up as well. You have to keep doing this diligently and slowly until the voltage stabilises. Once you find this point, you can reduce the idling to a low level. You would also feel that the carburettor is cold and there is slight moisture in the exhaust. These are indications that the tuning is perfect.
If you tune the carburettor to a very rich mixture, the low-end torque will be high. But the top speed will be less and you would feel decreased mileage. If you set it to a lean mixture, the low-end torque will be low. Even the top speed will be high and you would get high mileage. But the engine will heat prematurely. Hence, you must strive to achieve a balance.
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