The perfect air fuel mixture must be: 17.4 parts air 1 part gasoline.
Just like a Paint Brush gun fluid, the carburetor is spraying. He sprayed gasoline so that it is easily mixed with air.
A lot can be adjusted to a carburetor:
-Sprayer
-Sgas needle
-Ir air screw
-Sstationary screw
-The stationary sprayer
-Filter
But this depends on your own preference and setup on how you want to adjust your motorcycle.
A large carburetor does not have to run better and/or faster by definition. Make sure you have a warm engine when adjusting! Also make sure that the inflammation is 100% adjusted!
We can now start with the gross adjustment:
The sprayer
The sprayer hangs in the float chamber that is filled with fuel. Due to the underpressure that is created by the air flowing, the gasoline is "sucked out" through the sprayer. The size of the nozzle controls the amount of gasoline in the air.
In practice it is like this: if your sprayer is good you can accelerate at once in the high gear from the bottom of your rpm and it will continue nicely to full speed.
If your sprayer is too big, it will pull at the bottom but it is impossible to give full throttle. The engine does not want to run nicely and falls back in the speed from Volas and immediately turns off.
Too small a sprayer gives very little power at the bottom, but you can run a lot of revs with it. If you give full throttle in his free, he also hangs on speed and it does not fall back nicely.
How can you know that your mixture looks good?
First you drive around a bit, then you remove your spark plug from your cylinder head (don't burn your fingers because the spark plug can be pretty hot !!!) and look at the color of your spark plug:
With a well -adjusted carburetor, the spark plug sees coffee brown. With a too rich mixture, your spark plug looks black and nasty. With a too poor mixture you see spark plug white.
Gas needle
The gas needle ensures that your mixture is properly supervised. And arranges how far the sprayer is open on different positions of the gas slide. The needle is on one of the middle positions. The needle is actually a different adjustment of your sprayer. This allows you to finely adjust the nozzle with it, and change the characteristic of your engine a bit. The needle is to pick up the gas properly. The needle must be adjusted to the best on the gas. The higher the needle, the more fuel and there is more fuel with the air.
Aircraft
This is not on all carburetors. The air screw is the ultimate fine adjustment of the air. And so also from the carburetor.
How to adjust: you turn the screw completely and then open 1.5 stroke, this is the basic adjustment. However, you can turn until the engine reacts the most to the gas, but does not yet hang in the revs. (too much air)
With too little air, the engine reacts slowly to the gas and falls back too quickly in the speed. (almost no longer idle)
The stationary screw
Very easy actually this screw controls how far the gas slider is open when you release the gas. Make sure that engine is currently around 1500 to 2000 rpm. Too high is not good, but too slow is not good for your crankshaft and your bearings. The engine then gets a blow every time because it is not good at speed. Set the engine stationary to the speed that you think sound best. And where the engine can best respond from the stationary speed.
The idle sprayer
We usually find these nozzles on larger carburetors. These nozzles only dose the fuel spray to the 4000 rpm. After that, almost exclusively the main sprayer will take over. In an 18 and 20 mm, a stationary sprayer of 35 is used. If the moped does not want to run well and respond, the same actions should be made as the head of sprayer to find out what the right size is.
We have now arrived at the last part of this adjustment.
The air filter
This must be completely clean and closed when adjusting. The best for a normal engine is a standard air filter. An open filter (power filter) is only recommended for very fast engines. From a hp or 9, these filters are really useful. They provide more air but also more wear.
It is wise to take the carburetor apart before adjusting. Check the:
-Sprayer
-S
-If it is closed, it may not leak gasoline and it must also be straight.)
-Blow all holes well and if there is a hidden one can make very clever use a steel wire (from a steel brush).
-also check whether false air is not sucked in anywhere.
-Check whether the gas slide/gas needle is not worn out.
You do this by moving the gas slider back and forth (this must be minimal). The needle must be nice and slippery. It is advisable to replace the gas slide and needle (holder) in a set.
Adjusting properly also means listening well to your motorcycle, and knowing how a carburetor works, and must respond to every position of the bashing slide.
Sprayer Adjust
Adjusting the sprayer is fairly easy this we will do by hand of the color of the spark plug:
1. Go a lot of follow -up axle (make sure the engine is warm, so really a few kilometers away!)
2. Now turn off your scooter (at the time you are still driving)
3. Take your spark plug out immediately, but beware, it can be hot!
4. Look at the spark plug (or spark plug thread), now you can see the following colors:
- Black: Your sprayer is too big, so take a smaller one
- Coffee brown: Your sprayer is just right
- Gray: Your sprayer is too small, take a larger one
