Chainsaw Carburetor Adjustment Carver

Adjusting the carburetor of the Carver chainsaw and its device

The carburetor of the internal combustion engine of the Carver chainsaw is responsible for supplying the correctly metered fuel-air mixture. By increasing the mixture supply, when the throttle handle is pressed, the engine speed increases. Consistent idling is also dependent on proper carburetor operation. This is an important chainsaw system and you need to have an idea of ​​how it works, know the basics of diagnostics, and also be able to adjust and repair.

Chainsaw Carburetor Adjustment Carver

When carburetor adjustment is required

The new chainsaw is adjusted to the recommended mix. All you need is fine tuning with three screws; you don’t need to disassemble the carburetor. The purpose of the adjusting screws:

Carburetor Adjustment Chainsaw Carver

The best info on adjusting carburetors on a chainsaw

Greetings to you dear and most loyal readers of my blog. In this article, I decided to see how to adjust the carburetor on a chainsaw. After all, as it seems to me, you have repeatedly encountered a problem that your “darling” let you down when it was so necessary. And because we are economical with you and do not want to waste money on what we can do ourselves, then let’s learn how to adjust the carburetor on our chainsaws with our own hands, without recruiting professional repairmen. And as you will soon see, this is quite easy to do. For you, even nothing special is useful, to do. I specifically looked at the adjustment of carburetors of all recognizable brands of saws, each of which has its own tricks and aspects, and in my opinion this is the best information on the network!

Ural adjustment

It differs slightly in that it should not be carried out at sharp maximum rpm, but make sure that the chain picks them up quickly, but smoothly, without moving along the bus.

In any case, you should take the adjustment very seriously, because if it is done incorrectly, the saw will not stay with you for a long time. Take care of your tools and if you are not confident in your abilities, take it to a professional.

Any of them, even a strong friendship, needs attention and care. And then the chainsaw will be your faithful assistant for many years to come.

When purchasing a HUS365 chainsaw, you should be prepared for the fact that after a month of using it, you will not want to deal with any saw other than this brand. This is explained by its reliability, affordability, and most importantly, ease of management.

Chainsaw Carver Carburetor Adjustment

Why and how the chainsaw carburetor is adjusted

The gasoline engine works by burning a previously prepared mixture of air, oil and gasoline. Chainsaw carburetor adjustment is needed to prepare the mixture in the right proportion. It depends on the operation of the carburetor whether the engine will work with the declared power or stall.

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Carburetor device on chainsaw Carver

Most modern chainsaws (Carver are no exception) have either completely the same type of carburetors from the same manufacturer (for example, Walbro), or very similar in design. But even with differences in the appearance of the case, the principle of operation of all carburetors is absolutely the same.

But the carburetors on Carver saws differ from other chainsaws in the availability of adjustment. The adjusting screws on most other saw models are hidden under the body and often have unique shaped notches. Therefore, they can only be adjusted with special “proprietary” screwdrivers, which are sold in service centers. The Carver carburetor is adjusted with a regular flat screwdriver. There are three holes in the housing for adjusting screws. Therefore, the carburetor on the Carver chainsaw can be adjusted without even removing the cover.

What the three carburetor screws L, H, and T regulate.

Older chainsaw models have only two adjusting screws. One of them adjusts the idle speed by simply raising the throttle. When it twists, the passage under the damper increases, the supply of fuel to the combustion chamber increases, the engine increases speed. In essence, twisting “adds throttle” without pressing the throttle grip.

In modern Carver chainsaw carburetors, the idle adjustment screw T does not regulate the throttle position, but the amount of fuel flowing through the idle jet.

The L screw has a sharp needle-shaped tip inside and regulates the main fuel flow through the calibrated orifice of the jet.

There are two such screws in modern models. One. L, regulates the main fuel flow at low and medium speeds (not to be confused with idle). The second. H, determines the fuel supply at maximum speed.

The principle of operation of the Carver carburetor

After starting the engine of the chainsaw, the air damper opens, through which the purified air enters the diffuser with a fine filter. Gasoline gets there through calibrated holes in the jets. The amount of air-fuel mixture that enters the combustion chamber from the carburetor is regulated by the position of the throttle valve connected by a thrust to the throttle handle.

The needle valve shuts off the gasoline flow to the carburetor when it is filled. Gasoline passes through the filter before entering the nozzles, which reduces the risk of clogging the calibrated holes in them.

Carburetor device on chainsaw Carver

Most modern chainsaws (Carver is no exception) have either completely the same type of carburetors from the same manufacturer (for example, Walbro), or very similar in design. But even with differences in the appearance of the case, the principle of operation of all carburetors is absolutely the same.

But the carburetors on Carver saws differ from other chainsaws in the availability of adjustment. The adjusting screws on most other saw models are hidden under the body and often have unique shaped notches. Therefore, they can only be adjusted with special “proprietary” screwdrivers, which are sold in service centers. The Carver carburetor is adjusted with a regular flat screwdriver. There are three holes in the housing for adjusting screws. Therefore, the carburetor on the Carver chainsaw can be adjusted without even removing the cover.

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When customization is required

Modern “three-screw” carburetors of Carver chainsaws are practically not designed for manual adjustment at home. The screws are provided for factory adjustment, are securely fixed against rotation during vibration by tenacious springs and do not arbitrarily change their position.

But the screws on the carburetors of Carver chainsaws are available for adjustment through special holes without removing the casing, with a regular screwdriver. This suggests that such models structurally need carburetor adjustment from time to time.

The reason for this, from a technical point of view, cannot be precisely named. Only versions are possible:

  1. The carburetor of the Carver chainsaw is in an area of ​​increased vibration, because of this, the screws spontaneously unwind.
  2. A coarse spring is installed, which cannot fix the screw like on other models.
  3. Periodic adjustment is required due to the technical features of the carburetor and ICE of the Carver chainsaw as a whole.

Adjustment and device of the Carver chainsaw carburetor

The carburetor of the internal combustion engine of the Carver chainsaw is responsible for supplying the correctly metered fuel-air mixture. By increasing the mixture supply, when the throttle handle is pressed, the engine speed increases. Consistent idling is also dependent on proper carburetor operation. This is an important chainsaw system and you need to have an idea of ​​how it works, know the basics of diagnostics, and also be able to adjust and repair.

The main components of the Carver carburetor

The chainsaw carburetor consists of the following main components:

  • Cast body made of light alloy;
  • Diaphragm pump for manual pumping of fuel before starting (suction);
  • Diffuser;
  • Jets (strictly calibrated holes in bronze bushings for metering fuel supply);
  • Float chamber;
  • Spray.

Also in the carburetors of chainsaws there are fuel channels, a throttle (gas) adjustable damper, an air damper, filters and adjusting screws.

Chainsaw carburetor adjustment.

Why might it be necessary to adjust the carburetor even if it seems to start and work? Carburetor adjustments should be optimal.

In general, the carburetor has a very important effect on the operation of the chainsaw, it is its “brain” indicating how much air and fuel mixture to supply to the cylinder and in what proportion. If the mixture is “rich”, that is, there will be more fuel in it, then as a result we have a loss of power, deposits on the cylinder walls and piston. Which in turn can lead to the failure of the chainsaw. In turn, the “lean” mixture, which has more than the norm in its air composition, also leads to power loss, insufficient lubrication of the CPG, scuffing and possible “jamming” of the engine. Optimal settings of the chainsaw carburetor allows you to get maximum power, extend engine life, and ensure minimum emissions into the atmosphere!

“Rich mix”

A “rich” mixture is a fuel mixture in which the amount of fuel supplied to the carburetor exceeds the norm. In this case, the fuel does not have time to burn completely and less energy is produced than with the optimal fuel-to-air ratio. Partially unused fuel gets into the muffler, then the chainsaw smokes heavily.

Poor and rich mix

A little more about “lean” and “rich” mixes.

Chainsaw carburetor adjustment

Most chainsaws have three adjusting screws on the carburetor. In order about each:

  • T. Idling screw. The idle screw is responsible for the position of the throttle valve when the throttle handle is fully released. If the throttle valve is not open enough, the engine will stall when the handle is released, as the valve will cut off the fuel mixture supply. In the event that the throttle valve is opened to a greater value than it should be, then the chain will rotate, which is strictly prohibited by safety precautions when working with a chainsaw.
  • L-screw for adjusting low speed. This screw adjusts the amount of fuel in the fuel mixture when the chainsaw is idling. If the amount of fuel is large, the engine will stall under load, if there is not enough fuel, the result is engine overheating, seizures, and so on.
  • H-High speed adjustment screw. Responsible for the amount of fuel in the mixture when the chainsaw is running. If this adjustment is configured for a larger amount of fuel, then the engine works “unacceptably” and smokes, and if it is less, then we get too high revs and overheating.
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“Poor mixture”

There is an excess of air in the “lean” mixture, which is not good, as it has its drawbacks. Namely: insufficient energy in the flash (which means a loss of power as a result), excessive heating of the cylinder due to insufficient lubrication and high rpm, which leads to scuffing, and there it is not far to “jam” the engine.

Adjusting the carburetor step by step

  1. We check the condition of the air filter. We remove it and either clean it or change it. If the air filter is clogged with dirt and sawdust, the chainsaw will not work normally.
  2. We check the condition of the muffler. It should be clean and unforgotten. Read more about cleaning the muffler HERE.
  3. Before you start adjusting the carburetor, fill the fuel tank at least half.
  4. If the chainsaw is capable of starting, then let it run for a few minutes to warm it up. If the adjustment is carried out “cold”, then the mixture will be re-enriched after warming up.
  5. It is necessary to start the adjustment by adjusting the idle speed-screw L. It is highly desirable to have a tachometer, then we focus on 2700 rpm. If not, then we need to find the highest idle rpm. In this case, the chain should not rotate. If it still turns (the chain, of course, not the Earth), then we achieve its stop by rotating the screw T. The sound of the chainsaw should be like listening to the file below.
    https://benzopilatut.ru/wp-content/uploads/2016/01/Chainsaw-on-idle.Wav
  6. We regulate high rpm. Screw H. If we rotate it clockwise, then the rpm will increase, and if counterclockwise, it will fall. We twist it until there are dips in the ignition. After that, we turn it out about one-fifth of a turn. The sound of the chainsaw when working at maximum speed should be the same as when listening to the file below.
    https://benzopilatut.ru/wp-content/uploads/2016/01/Chainsaw-maximum- revs.Wav
  7. We check how the chainsaw is gaining momentum. She must type them smoothly and quickly. If the revolutions grow slowly, then slightly unscrew the screw L.

If you have any questions, write in the comments or better in the VK group.

Remember that the optimal carburetor setting is: