How To Adjust The Carburetor On A Partner 351 Chainsaw

Chainsaw Carburetor Partner 351; from device to adjustment Carburetor for the Partner 351 chainsaw, its design and adjustment. Carburetor repair. Advantages and disadvantages. Types of carburetors on Partner 351 XT.

Maximum RPM

Turn screw H clockwise until maximum speed is reached.

The Partner 351 saw, according to the instruction manual, has a rotation speed limit of 13000 rpm. Exceeding this indicator is unsafe for the engine and is manifested by characteristic interruptions in the ignition and “singing” of the internal combustion engine, which can be corrected by gradually turning the adjusting screw in the opposite direction.

Basic setup

  1. Tighten screw T clockwise as far as it will go and then turn it 4.5 turns in the opposite direction.
  2. Tighten the screws H and L carefully to the end and then back out 2 turns.
  3. If the engine does not stall at idle, the chain does not move, the engine accelerates quickly and runs smoothly, then the basic adjustment is sufficient. If not, fine tuning is required. The chainsaw should be started and warmed up for 5-10 minutes.

Advantages and disadvantages

The main task of the engines of motorcycle tools, in particular, chainsaws, is stable and confident operation in any position with respect to gravity. This feature, provided by a diaphragm carburetor with a built-in pump, along with its structural simplicity, is a significant advantage of the Partner 351 internal combustion engine supply unit.

The disadvantages of the carburetor include the relative complexity of the adjustment, the narrow range of the amount of the mixture at the outlet, and slow transitions between steady-state modes. In addition, it is sensitive to accelerations perpendicular to the membranes.

how to adjust the carburetor on a Partner 351 chainsaw

Gasoline does not flow into the chainsaw carburetor

If the fuel does not enter the standard chamber, then this may indicate several breakdowns at once. The first step is to check the air and fuel filters. During long-term operation of the saw, these elements absorb a large amount of dust, which further prevents the infiltration of clean air and fuel. A slightly dirty filter can be cleaned with gasoline, but if the part is clogged with a lot of dust, it will need to be replaced.

Another cause of the malfunction is the needle. This part sticks, especially in Chinese-made chainsaws. To fix the problem, in most cases it will be sufficient to simply move the needle.

If no fuel enters the chamber, the saw owner should inspect the tool seals. After several months of using the tool, these parts lose their tightness. Over time, they begin to leak gas, as a result of which the instrument stops starting. Repair is carried out by replacing the oil seals.

The breather plays an important role when starting the saw. It is located near the saw’s gas tank cover, and performs 2 tasks at once. It maintains optimal air pressure and does not allow fuel to flow out. To check the breather, you will need to turn off the fuel pipe and see how much gasoline flows out. If it does not leak at all, then the standard breather is clogged with debris and dirt. In this case, you will need to clean the element and reinstall it.

If fuel does not enter the chamber, then you need to check the fuel line. Most often, a Chinese hose is used to complete a budget class tool, which loses its tightness over time. In this case, it will be necessary to replace the line, paying special attention to the tightness of the channel joints.

Chainsaw carburetor

Chainsaw carburetor Is an element that is responsible for mixing the air-fuel mixture. Not only the stability of the engine, but also the speed of the entire chainsaw depends on the condition and serviceability of this important unit. In this regard, each owner of a garden tool should study the design of the carburetor, as well as familiarize himself with the rules for its maintenance and repair.

Chainsaw carburetor adjustment. What a beginner needs to know?

Initially, all adjusting bolts are in the factory positions. This ensures that the optimal amount of fuel and air is sucked in. However, due to prolonged use of the saw in difficult conditions, the factory settings of its carburetor may be violated. Even a slight movement of one of the bolts by 1/5 of a turn will seriously damage the saw motor. In this regard, the operator must constantly monitor that the adjusting bolts are in the optimal positions set at the factory.

If for some reason the work of the node has been disrupted, then it will need to be reconfigured. For this, 3 adjusting bolts are provided in the assembly device. The first of them is marked with the letter H. It is needed to tune the engine of the chainsaw when operating at maximum speed. The second screw marked L is used to adjust the motor when running at low rpm. The third screw can be labeled T, S or LA. Its task is to configure the internal combustion engine when operating in idle mode.

Chainsaw carburetor tuning must be carried out with a completely serviceable engine. Immediately before adjustment, you will need to inspect the air filter and, if necessary, clean or replace it.

Chainsaw carburetor device

Not a single repair event is complete without knowledge of the basics of the mechanism. By understanding the constituent elements and the principle of operation, it is easier to determine the cause of the breakdown.

Any malfunction in the carburetor threatens to stop the engine

The carburetor is one of the main functional parts of the engine, which serves to prepare and supply a fuel mixture consisting of certain proportions of fuel and air. As soon as the proportions are violated, the engine starts to “junk”, or even stops working altogether.

You can achieve the correct operation of the carburetor by examining its “filling”:

  • Cross-flap tube for air flow regulation.
  • Diffuser. Constriction to increase the air flow rate, located near the fuel inlet.
  • The nozzle from which fuel comes (fuel needle in the diagram).
  • A float chamber that regulates the fuel level at the entrance to the channel.

How it works: A jet of air in the diffuser atomizes the fuel, creating a mixture that enters the cylinder. The more fuel is supplied, the higher the engine speed. Different carburettors work in the same way.

Chainsaw carburetor adjustment: we analyze all the technical nuances of the work

Summer cottage construction and repairs are not complete without the use of a chainsaw, as well as garden maintenance. Due to a malfunction of the tool, all work can get up, so it is so important to be able to disassemble it yourself, find problems and fix them. With sufficient experience and dexterity, it is even possible to adjust the carburetor of a chainsaw. A complicated procedure, or rather, jewelry. How to carry out the adjustment procedures, we suggest you disassemble today.

Step by step instructions for disassembly

The carburetor device of models of different brands is almost the same, so take the Partner chainsaw as an example. We carefully remove each element and put it in order to make it easier to assemble later.

Chainsaw carburetors from different manufacturers, if they differ, it does not matter

The top cover is removed by unscrewing three screws. Following it is foam rubber, an integral part of the air filter.

The arrows indicate the bolts that must be unscrewed to remove the cover

Then we remove the fuel hose, followed by the drive rod.

The upper arrow points to the fuel hose, the lower arrow to the drive rod

Next, remove the tip of the cable.

The arrow shows the end of the cable to be removed.

On the left from the fitting, we pull together the gasoline hose.

We also carefully remove the gasoline hose indicated by the arrow

We finally disconnect the carburetor, it is ready for adjustment. Its mechanism is rather complicated, therefore, if further disassembly of the carburetor is required, the elements should be removed very carefully. They are small, so they can be lost.

The carburetor consists of many small parts, which should be laid out in order during disassembly.

Factory settings

The factory default setting for the Husqvarna carburetor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L). In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed.

Adjusting the carburetor of your Husqvarna chainsaw

Modern chainsaws have a complex system and consist of several main units that periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on your Husqvarna chainsaw.

Husqvarna carburetor adjustment algorithm and description

The Husqvarna carburetor adjusts in the same way as the carburetor settings on other brands of chainsaws.

The order of work is as follows:

  1. The cut-off saw is set to the factory settings for the Husqvarna carburetor.
  2. The engine starts and the saw warms up for a few minutes.
  3. By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be turned back 1⁄4. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
  4. The next stage is adjusting the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle stick is squeezed out to full, after which the tachometer readings are checked. If the value of the maximum revolutions differs from the maximum number recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are returned to normal.