Advice 1: How to adjust the carburetors for motorcycle

Carburetors installed on a two stroke, motochika, have much in common in the job settings. Before adjusting carburetor, check the condition of air filter, exhaust system, hoses and clamps systems intake and exhaust, the shape of the carb, the availability and condition of the nozzles, needles, valves. The engine warm up to operating temperature.
Instruction
1
Adjust the fuel level in the float chamber. To do this, adjust the height of the float, according to the instructions. The installation accuracy of the fuel level will seriously affect the further adjustment of the carb, be careful. Configuring the operation of the carb with the throttle closed (idle speed adjustment) take not less carefully, because they depend on future adjustment. This is due to the fact that system idle is running at any throttle position.
2
Idle adjust with the needle valve idle screw screw quality and quantity of the fuel mixture. The jet is idling look at the carb body; and can be accessible when it is removed the float chamber. The screw is usually made of brass and stands on the outside of the carb on the left wall. The screw amount of the fuel mixture is located above the screw. Turned on and warmed up the engine with a screw install stable idling speed tube and fold back the screw from its zero position. A screw quantity of the fuel mixture adjust the amount of idle.
3
The transitional regime is considered such a mode of operation of the carburetor, the throttle is a value from 0% to 25%. To ensure the safe operation of the engine in transient mode, choose a jet at idle, adjust the idle speed and the size of the cutout in the throttle. The need to change the last parameter is rare. In most cases, to configure transition mode, check the adjustment of the idle speed, fuel level (see section 2) and a shut-off needle valve of the carburetor.
4
On four-stroke motorcycles in the transitional regime included in the operation of the accelerator pump. Most often it is driven by a separate spring. Adjust the accelerator pump by changing the stiffness of the springs and sizing the feed and overflow orifices.
5
Especially the carb settings at partial throttle (25-75%).

Mode when you open the throttle on the value of 25-50%, adjust the clearance between the needle and the walls of the tunnel carb. To do this, change the diameter of the needle (needles vary in diameter of a cylindrical part with a step of 0.01 mm). In operation, when the throttle 50-75% of the spend adjust by changing the position of the carb needles up or down. You can replace the needle at a more acute or more full (according to the profile of the conical part). To access the needle remove the cap from the carb. On most motorcycles the carb will have to be removed.
6
The carb adjustment in full (75-100%) throttle opening swipe by changing the size of the main fuel nozzle. Can be accessible from the outside of the carb when you removed the drain plug of the float chamber. A correct adjustment of the test or at the hearing (with sufficient experience), or by color of the insulator of the spark plug. For this test drive mode "full throttle". After 45 sec. after the full opening of the throttle turn off engine and remove the spark plug on the go (in neutral). The insulator should have a dark brown color. If black insulator color, obecnice fuel mixture. If orange color – enrich the mixture. When red-brown color, completely replace the gas used, because it contains harmful metal-containing antiknock additives.
7
On some motorcycles apply to additional jets, which are used at high speeds and handling of the electromagnetic valve. The quality of the fuel mixture at high rpm adjust, replacing these nozzles.

Advice 2: How to set carburetor for motorcycle

The most common motorcycle carburetors have five basic tools for adjustment. The main adjustments are carried out with their help, additional adjustments are carried out individually, depending on the specific brand of carb.
Instruction
1
Find on the body of the carb screw idle mixture. To enrich the fuel mixture a slightly lower idle speed wrap this screw. This screw regulates the work of the carburettor mode throttle opening to¼. On some models of carburetors to enrich the mixture need to Unscrew this screw. Resistant the idle screw can also find on the carb body. It limits the lowering of the spool of the throttle. Tighten the screw to lift the valve core of the throttle and increase engine speed.
2
Adjust the quality of the fuel mixture through the dispensing needle, which can be attached in different positions spring loaded. Adjustments submitted via this needle, affect carburetor operation mode ¾ to full speed. For the enrichment of the fuel mixture install the spring latch in the lower groove. For the lean, move the clip to the top. On some models of carburetors latch is adjustable in 8 different positions. In addition, the needle can be mounted without a latch.
3
The quality of the fuel mixture for the operation of the carburetor in the full stroke, adjust the selection of the main nozzle with the sprayer. The selection of this nozzle will also affect the operation of the carburetor in all modes. In various carburetors needle valve can be positioned both horizontally and vertically. If there are multiple grooves on the shut-off needle float chamber adjust fuel mixture for all operating modes. To impoverish the mixture, move the needle higher, relative fuel level in the float chamber.
4
On carburetors with missing system idling adjustment of spending by the metering needle, main fuel jet, and the thrust of the idle screw. On the carburetors of old patterns and simplified carburetor adjustment run, varying the gap under the throttle valve with fitting-emphasis.
5
Before adjusting the carburetor, run the engine. Start with the IAC. On the cover of the mixing chamber screw the thrust screw until the end. Candle install clean and reliable. The four-stroke engine set later than the ignition. Start the engine and close the hand valve of the throttle. If the engine stalls, start to slowly Unscrew the stop screw the idle speed up until the engine will not be operating steadily with the throttle closed.
6
Then screw the quality (composition) of the fuel mixture will put the maximum engine speed. Then screw the idle speed decrease idle speed until the appearance of signs of unstable operation of the engine. Thus, adjust the carburetor, alternately increasing the revs by a lean condition and reducing the rpm by reducing the size of the gap under the throttle. Upon reaching stable operation of the engine idling at minimum speed, loosen the adjusting screw of quality of a mix in ¼ turn and lock it, preventing displacement of the set position. Note: if the carb is worn, qualitative adjustment of idling to achieve not to turn out.
7
When you adjust the carb on the secondary modes keep in mind that when moving the dispensing needle up will increase the throttle response of the motorcycle and increase fuel consumption. If throttle response and fuel consumption is satisfactory, do not move the metering needle. If the spark plug is clogged with soot, will obecnice fuel mixture, lowering the metering needle one or two grooves. To eliminate detonation and reverse flashes in the carb, raise the needle 1-2 positions.
8
If full-stroke engine does not develop full power, test the operation of the carburetor with a different size main fuel jet. To increase the power of the engine should be set to jet with a capacity 10-20% higher.
Useful advice
All systems carb motor work in parallel and constantly depending on throttle position. From this it follows that the error in the adjustment of one of the modes may lead to further errors in setting up the carb. When holding the carb adjustments a detailed description of the specific model and adjusting the table look at the supporting documentation for the motorcycle.
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