Chainsaw Partner 350 repair instructions. Chainsaw Partner 350: faults and their elimination

One of the main features of this saw, its users note durability of operation with a minimum number of failures.
And yet they happen. To determine why the saw stopped working, you need to perform basic diagnostics. If the saw does not start, then:

there is no spark on the spark plug;
fuel is not supplied;
no air coming in.

First you should check for the presence of a spark: by unscrewing the spark plug, connecting it to the high-voltage wire and placing it on the cylinder, pull the starter. If there is a spark, then clean and adjust the gap on the spark plug (0.5 - 0.65 mm). If it is not there, then you need to change: either the flywheel or the coil (magneto). In addition, the spark plug itself may fail or the high-voltage wire may break.

The next step is to check the fuel supply. To do this, you need to disconnect the supply hose from the carburetor and check its presence. Absence may indicate that the fuel filter or delivery system is clogged. The carburetor itself may also become clogged.

If you do not have experience in repairing and cleaning it, entrust this work to specialists.

If the air supply deteriorates, the saw should start, but it will not work well. Remove and wash the air filter. Put it back in place only after it has completely dried.

If the saw starts well, idles and stalls when gas is supplied, the muffler is most likely clogged. Remove, disassemble, wash, put back and continue working.

You can also easily change the saw bar and chain, carburetor, starter, oil pump, ignition and clutch with your own hands.

And you will be able to replace a broken starter cable after watching this video:

We recommend entrusting more complex chainsaw repairs related to replacing the cylinder-piston group or crankshaft to specialists, although if you are familiar with two-stroke engines, then this work will not be difficult for you, and spare parts for Partner chainsaws are not in short supply in Russia.

To enlarge a picture, click on its thumbnail.

We advise you to regularly monitor the serviceability of the safety group: brake and chain catcher. Remember that the saw should be thoroughly cleaned of small chips. It can not only clog technological holes in the oil pump and other places, but also interfere with the operation of the brake.

Operating Instructions for Partner 350

In this manual you will find not only a detailed description of the saw, but also basic techniques for working with the tool. We would like to draw your attention to the fact that this chainsaw can run on AI95 or AI92 gasoline with the addition of oil for two-stroke engines in a ratio of 1:50.

Chainsaw Partner 350 Malfunctions And Their Elimination

Chainsaw “Partner” 350 is a reliable assistant with proper care

In a rural farmstead or dacha, a cheap and trouble-free Partner 350 chainsaw came to replace a two-handed tool and a hacksaw. Description of the technical characteristics of the partner 351 chainsaw. Design, possible breakdowns and ways to eliminate them. At first, the Swedish brand transferred the rights to the brand with a production site in Russia. Chainsaw Partner 351: characteristics and adjustment. Chainsaw partner 350. 5 main faults and their elimination. Malfunctions and theirs. Therefore, with appropriate quality, the tool is cheap. The model is very comfortable for amateur use. The cost of the Partner 350 chainsaw is from 5 to 9 thousand rubles, depending on the configuration, applicable.

Content

Principles for choosing a chainsaw

So, the question arose of which saw to choose for work on a summer cottage. Of course, it must be a chainsaw , because it is mobile and does not depend on the energy source. Such a device can be used on a tourist trip to collect wood debris in the forest.

High-quality products, not just saws, are identified by well-known brands. But here there is a danger of falling into a replica made in artisanal conditions. Therefore, it is worth taking a closer look at the product. More often, expensive instruments from global favorites Stihl, Husqvarna, Echo, Solo are counterfeited as expensive brands. The main faults will be that the hand chainsaw “Partner 350 Partner 350” is reliable. Therefore, the Partner 350 chainsaw from the manufacturer can be purchased with the least risk.

The weight-power ratio has a direct relationship. Therefore, a professional tool for country use is not always suitable. You should choose a home assistant with a small amount of power. The 45 cm tire size on an amateur saw is an advertising ploy, it reduces the life of the motor, and the saw device will jam when pulled through.

The chainsaw is an over-threat item. When working, it is necessary to ensure that children and animals are not accessible to the place of work. Chainsaw Partner 350 is one of the most common gasoline saws. Very often their owners ask questions about how to repair Partner 350. Cutting small boards is best done on specially equipped racks. For your own safety, wear buttoned clothing, glasses and protective gloves. Your feet should be wearing comfortable, stable shoes.

READ Chainsaw Carver Promo Psg 45 15

Functions for vibration damping, easy starting, comfortable chain tension, and the availability of an air filter add additional convenience to the operation of the tool. Setting up a partner 350 s chainsaw, setting up a carburetor with your own hands, troubleshooting, disadvantages of a chainsaw. Of the economical household saws, the Partner 350 S chainsaw is in 5th place in the ranking of the most needed ones. Malfunctions and repairs of the Partner 350 chainsaw. And in terms of cost-quality ratio, this is the best mechanism.

Technical characteristics of the Partner 350 chainsaw

The most common saw from the “Partner” series is the Partner 350 S. Stihl 180 chainsaw: malfunctions and repairs. This model is used for longitudinal and transverse sawing of wood. The tool is designed for a bar length of 40 cm. Among the options, the device is equipped with:

inertia chain brake and integrated switch;
electric ignition;
spring for easier engine starting;
vibration damper;
automatic chain lubrication.

Main characteristics:

power – 1.5 kW;
shaft angular speed – 13000 rpm;
working volume of the combustion chamber is 40 cubic meters. cm;
tire length – 40 cm;
chain pitch - 3/8 inch;
total weight – 4.7 kg.

Chainsaw Partner 350 malfunction Cause and troubleshooting

The chainsaw stalls

when you press the gas.
Chainsaw Partner
370 began to stall with the slightest pressure on the handle

The chainsaw stalls when you press the gas

Chainsaw repair

.Carburetor repair. Carburetor adjustment.

Practical tips for operating the Partner 350 chainsaw are presented in the video:

After proper running-in and adjustment, the operating mode of the saw allows you to perform a wide range of work, including longitudinal cutting of wood.

Studying the operating instructions for the Partner 350 chainsaw

It is unacceptable to work on complex household appliances without studying the device and operating rules. Elimination and chainsaw first works on faults, causes. Instructions from the manufacturer in Russian translation include the following topics:

list of components and parts;
information on how to correctly read symbols on equipment;
safety precautions when working with a saw and compliance with sawmill technology;
instructions for the assembly sequence of the tool;
correct composition of fuel mixtures and requirements for chain lubrication;
instructions for maintenance of individual components;
table of problems and methods for eliminating them;
technical characteristics of the Partner chainsaw .

READ Chainsaw Stretched

Official documents developed to help equipment owners provide comprehensive information on the correct operation of the saw.

Only use a low-kickback saw chain on the tool. Due to the cutting depth limiters, it is safer for amateur use.

Conditions for self-repair of chainsaws Partner

for the owner of the tool who has the skills to repair household appliances to fix the malfunction independently after the end of the warranty service. First you need to learn the technique. Chainsaw Partner 350: characteristics, faults and theirs. Experienced craftsmen believe that repairing a Partner 350 chainsaw with your own hands begins with correct diagnosis. Chainsaw stihl 180: faults and repairs by yourself. To determine the nature of the repair, you must:

check the ignition system;
perform diagnostics of carburetor operation;
fuel system efficiency;
clean the muffler;
determine the performance of the piston system;
check chain lubrication;
determine the wear of components and the required spare parts for the Partner chainsaw.

Complex issues must be resolved with the involvement of specialists for consultation.

If the engine refuses to start, first of all check whether the spark plugs are working properly. They must be dry and have a contact gap of 0.5-0.65 mm. Based on the condition of the unscrewed spark plug, you can determine signs of problems in the fuel system and equipment operation.

Check the serviceability of the spark plug by connecting it to the starter through the cap and placing it on the cylinder body. The spark plug is good if it produces a spark on the housing when the starter is pulled. If there is no spark, the wire is faulty or the spark plug is flooded or has expired.

A saw that has been used a lot may experience carburetor malfunctions. But first you should adjust the carburetor of the Partner 350 chainsaw, as shown in the video:

READ Tire for Husqvarna Chainsaw

Repairing the carburetor can temporarily extend the engine's operating time. The Stihl chainsaw is easy to repair the Stihl chainsaw in case of lubrication problems and their elimination. The passages in the carburetor can become clogged with low-quality fuel or through a leaky air filter. When disassembling the unit, it is necessary to wash and blow through all parts.

It is better to entrust the repair and adjustment of the carburetor, as the most critical component, to a specialist.

If fuel does not enter the cylinder:

You can clean the fuel filter after you have made sure that the fuel flow from the hose is low. Depending on the degree of blockage, it needs to be cleaned or replaced with a new one.
If the injection is clogged, remove the hose and clean the hole with a needle.
Not enough air enters the carburetor through a clogged air filter. Basic malfunctions of chainsaws and do-it-yourself repairs. The supply of mixture to the engine is disrupted.
Incorrect carburetor adjustment will lead to the same result.

The chain is not lubricated. To avoid overheating of the chain and its pulling, lubricant must be supplied to the working unit automatically. But since the oil is supplied through the channels, they can become clogged with fine wood dust. Basic malfunctions of chainsaws and do-it-yourself repairs. Repairing chainsaws with your own. After each cycle of work, the canvas and gaps must be cleaned of dust and dirt. If oil is leaking, you need to check the integrity of the hose and the tightness of the connection to the tank. To eliminate them, malfunctions and methods, which the “Partner 350” chainsaw has. Replace the faulty hose or temporarily cover the hole with sealant. Repair the oil pump.

Malfunctions of the Partner 350 chainsaw include failure of long-term use parts. If the sprocket, tire, rubber anti-vibration seal is worn out, or the chain becomes dull, you need to take action in a timely manner. In harsh operating conditions, they must be under control, replaced, sharpened, and tightened on time.

Source

How to change the throttle cable on a chainsaw Partner. Repair of Partner P351XT chainsaw. Episode 1 Disassembly

If the saw does not start, then:

there is no spark on the spark plug;
no fuel;
no air comes.

First, check for spark: unscrew the spark plug, attach it to the high voltage wire and slide it onto the cylinder, pull the starter. If there is a spark, clean and adjust the gap on the spark plug (0.5 - 0.65 mm). If this is not the case, you need to change: either the flywheel or the coil (magnet). In addition, the spark plug itself or the high-voltage wire may break.

The next step is to check the fuel supply. To do this, disconnect the supply hose from the carburetor and check its presence. Absence may indicate that the fuel filter or delivery system is clogged. And the carburetor may also be clogged.

If you do not have experience in repair and cleaning, entrust this work to specialists.

If the air supply deteriorates, the saw should start, but it will not work properly. Remove and wash the air filter. Place it back only after it is completely dry.

If the saw works well, it works at idle and stalls when gas is supplied. The muffler is probably blocked. Take-off, dismantling, washing, installation and operation.

Easily with your hands you can also change the saw blade and chain, carburetor, starter, oil pump, ignition and clutch.

Chainsaw Partner 350 Starts and stalls. Related Posts

Why does the chainsaw stall when you press the gas?

Hello! If you find yourself on this page, then, most likely, your chainsaw stalls when you press the gas, and you want to find out why this is happening and what to do about it. Anyway, I’ll try to help you in this dilemma by examining the most common causes of such chaos, as well as ways to eliminate them.

To begin with, I’ll immediately write for novice users that many chainsaws require warming up the engine at idle for about one minute before use. Why does a chainsaw start and stall - reasons and reasons. Now the chainsaw has stalled and will not start, or the chainsaw has stalled and stalled. Until the engine is warmed up, the saw may stall when gas is added.

So, if a heated chainsaw can idle, but stalls under load, then this means that:

the carburetor is incorrectly configured or clogged - the most common case;
it does not have enough air, the consumption of which increases sharply with increasing speed - this means that the air filter is dirty (an extremely rare case, because the filter becomes dirty evenly, which is why the user first notices a loss of power);
it lacks fuel, the consumption of which also increases with increasing speed - this means that the fuel filter is dirty (also an uncommon occurrence);
Well, the worst case is if there is excessive friction between the piston and the cylinder wall due to a lack of oil in the fuel mixture - after such work with a chainsaw, you will most likely end up having to repair the piston group, because clogs form on the piston and cylinder walls, preventing saw operation.

Let's look at these cases separately.

Do-it-yourself Partner 350 carburetor setup

Before starting adjustment work, it is necessary to clean the main fuel unit from dust and dirt. To do this, you can use a compressed air compressor or a carpentry brush.

To adjust the carburetor, there are holes on the left side of the power unit, but to make it easier to determine their position, experts recommend removing the protective plastic casing. First, tighten the fuel quantity and quality screws all the way clockwise, then loosening them by 1/5 ... ¼ turn.

Partner 350 chainsaw carburetor with adjustment screws

With the cover removed, you need to know that the fuel mixture quality screw is located on the right and, accordingly, the gasoline quantity adjustment screw is located on the left. For convenience, the carburetor body is marked under the bolts:

— “L” — fuel quantity screw (adjustment at low speed);

— “H” — mixture quantity screw (setting at maximum speed);

— “T” — idle speed adjustment bolt.

It is necessary to remember that the carburetor adjustment of the Partner 350 chainsaw must be done on a warm engine. At high temperatures, the metal expands linearly, as a result of which the throughput of the channels increases.

As soon as the cylinder becomes warm, tighten screw “L” until the internal combustion engine produces maximum crankshaft speed. Then tighten it a quarter turn. It is worth noting that in this position the mixture supply quantity screw should maintain the engine running at idle speed. If this setting is not enough, then feel free to unscrew the “T” bolt until the engine runs stable. Using screw “H” we adjust the operation of the Partner chainsaw at maximum speed.

Diagnostics of crankshaft bearings

An important factor in the correct operation of the engine is the bearings and seals of the crankshaft.

Crankshaft Partner 350 with bearings

To diagnose their wear, it is necessary to shake the flywheel mounted on the shaft in the vertical and horizontal plane. If there is obvious play, the rolling bearings must be replaced. If there are oily marks on the crankcase, the seals will also need to be replaced. It would be a good idea to check the crankshaft play of the Partner 350, for which we remove the cylinder and piston. Using our hands, we shake it left and right, thereby imitating natural movement.

Chainsaw Partner 350 does not start. How the mechanism works

In fact, all tools, both foreign (Husqvarna, Makita, Shtil, Partner 350), and Chinese chainsaws, and Russian (Druzhba, Ural), are designed identically. Chainsaw partner 350 does not start. Therefore, finding the reason why the device does not start and stalls will not be particularly difficult.

There are four elements where difficulties may arise:

The fuel for which the carburetor is responsible;
Lubrication;
The air that comes in;
A spark, the quality of which depends on the ignition unit.

They all depend on each other and interact with each other. If any element does not work correctly, the saw stops working.

Let's start with the fact that all tools start up differently - hot and cold. Two commonly used mechanisms are responsible for this process.

Be sure to look at what is written in the user manual. It states that when turning it on, you need to make sure that the emergency stop brake is engaged. But starting a saw with a brake is much more difficult, so sometimes it’s better not to turn on the brake.

As you can find out from the instructions, inside the body there is a fuel tank and an engine, and outside there is a saw part (bar with chain), a handle and a starter.

First you need to figure out exactly how the tool won’t start. For example, the saw starts up, but immediately stalls, or loses power and cutting quality.

Perhaps interruptions in operation occur due to problems in the engine. Stihl chainsaw won't start: how to start it. But I would not recommend disassembling it right away. The chainsaw does not start: reasons and methods. Your chainsaw won't start? That the chainsaw won't start. (Husqvarna). It is better to look for the problem from the simplest option.

Saw Partner 350 stalls

Content

Why does the chainsaw stall when I press the gas: premises and solution

There are often cases when owners of chainsaws are faced with their breakdown and it does not matter at all what model of this type of equipment, because the nature of breakdowns is almost the same for everyone. Well, the chainsaw has stalled, so what next? Of course, you can take the equipment to special services that will repair your “iron friend” for a fee. But as they say: why pay more?

After all, you can personally disassemble the tool and repair it, because the damage may be insignificant, but in the service you will pay a lot for it. But naturally, in order to bring a tool back to life yourself, you need to be able to understand the reasons for its breakdown and methods for eliminating defects. So let's educate ourselves! In this article you can find answers to questions regarding situations when the tool simply stalls after a specific press on the gas. So let's get started.

Basic elements of chainsaws

Before we begin to delve into the issues of tool breakdowns and repairs, let’s first understand what a chainsaw actually consists of. First, I would like to note that this tool belongs to the category of equipment whose operation directly depends on the gasoline engine.

It is also important that chainsaws are equipped with an engine with one cylinder , and the work of which is done on such fuel as gasoline. It should be noted that, despite the similarity with other tools, it does not have a gearbox. And it is replaced by a typical single-stage chain transmission, the means of which is the movement of the chain (saw) itself.

In fact, a chainsaw is a fairly ordinary design, but this does not prevent it from being reliable, convenient and capable of fully ensuring uninterrupted and cyclic operation even in rather difficult conditions. This tool consists of a huge range of certain parts “vital” for its correct and productive operation. This is a carburetor, a direct chain tensioner, a tire equipped with a chain and other elements.

Before purchasing a chainsaw, be sure to explore all the options and choose the brand of chainsaw that is right for you.

To make your choice easier, we have compiled a rating of chainsaws based on reliability.

If you have a limited budget, then read the article about Russian chainsaw manufacturers.

Characteristics and possible causes of failure. Fixing the problem yourself

Chainsaws are fairly reliable and lightweight designs. Therefore, if you properly care for them and handle them based on the manufacturer’s advice, then they fail very rarely and various types of breakdowns are quickly eliminated. But if you are faced with this situation and want to repair your own instrument yourself, without resorting to the help of experts, then delve into the information presented below.

READ Saw Stalls When Hot

In fact, it is impossible to unambiguously and accurately determine the reason why the tool does not start or stalls when you press the gas, because there are quite a few reasons that influence this. But we should not forget that, starting from the fact that the chainsaw is armed with a conventional two-stroke engine, such conditions as lubrication, fuel, spark and air are important for its effective performance.

Chainsaw fuel tank

As follows, it is the carburetor that produces the fuel-air mixture, the filter cleans the air from dust, the ignition unit and spark plug produce a spark, and the gasoline contains lubricant.

That is why it is necessary to search for the circumstances of this kind of breakdown in order, starting specifically from the easy ones and gradually moving on to the complex ones. And this is a fundamental factor in proper repair, because the person who, without thinking about it, begins to disassemble the carburetor, puts it at risk. (Partner) 350 s. What starts and stalls when the saw starts and immediately. Because this kind of unit must be repaired or adjusted directly in special workshops (read about carburetor adjustment).

for trouble-free operation of the tool, it is necessary to be quite attentive to the fuel itself

The chainsaw stalls when you press the gas

The chainsaw stalls

when you press the gas.
Chainsaw Partner
370 began to stall at the slightest pressure on the handle

Chainsaw repair PARTNER. It starts, but immediately stalls.

Repair chainsaw PARTNER

.
Starts, but immediately stalls. Repairing a PARTNER
can be done with your own hands.

And also use only the oil that is made by the manufacturer of your tool. In addition, it is important to prepare this kind of mixture in the amount that you will definitely use in one or two weeks, but no more (see the proportion of gasoline and chainsaw oil).

Because otherwise, overexposure of the mixture directly in the canister will lead to it losing all its octane properties and this will lead to significant problems with the instrument.

The cause of a breakdown can also be the direct pouring of the mixture into the spark plug at the moment when the mechanism is started . Partner 350 air, a small puddle of fuel accumulates and after that the saw stalls. In order to solve this problem, you need to turn out and dry the candle, but remember that it should not be heated under any circumstances. Excess fuel must be drained through the hole (spark plug), wait 20-30 minutes, then put it back in place and try to start the tool again.
The chainsaw stalls when you press the gas because there is no spark . This can happen when there is no good contact between the tip of the spark plug and the wire (high voltage). However, if this kind of connection works correctly, but there is still no spark, then the ignition unit (electronic) is the cause. It is important to note that these types of spare parts cannot be repaired, so they can only be replaced. Inspection of the spark plug

READ Connecting the Primer to the Carburetor of the Partner 350 Chainsaw

Do not forget that by examining the spark plug you can obtain significant information regarding the breakdown of the chainsaw. Since if its surface is dry, then the reason for this is the cylinder, into which fuel is not directly supplied. That is why you will have to check the entire range of its supply step by step. If the spark plug is covered in black soot, this means that the carburetor is not working properly, that is, it supplies either a lot of fuel or pours oil directly into gasoline.

If the chainsaw stalls when gas is added, this means that there is not enough fuel supplied for the chainsaw to fully operate . The reason for this may be either a clogged carburetor (its jet) or contamination of the filter itself (fuel). Remember that the first unit should be checked exclusively by professionals, but you can clean the second one yourself.
In addition, the cause of breakdown can be the filter (air) if it is contaminated with dust . But do not forget that each model has its own easily eliminated and characteristic features. It is for this reason that do not hastily start disassembling and repairing the instrument, but it is best to “walk” through the forums, where there are a huge number of reviews from various owners, so as not to make things worse.

Since, for example, a Stihl chainsaw stalls when you press the gas for a simple reason, namely a simple clogging of the direct breather.

In order to solve this kind of problem, all you have to do is disconnect the (fuel) hose from the carburetor and pay attention to whether fuel is leaking out of it. Since if the mixture flows in a full stream, this means that the breather is not contaminated, but if on the contrary, then the cause of the breakdown has been found.

Here is another reason why a chainsaw stalls when you press the gas - muffler . It is this part that can interfere with the full operation of the tool in cases where it is directly contaminated with exhaust resinous deposits. To do this, you just simply need to clean it.
Quite often the partner chainsaw stalls when pressed and the reason for this is the cylinder-piston group . Since by examining them, namely the piston and cylinder, you can easily determine the cause of the tool malfunction by directly replacing them. You can also directly bore the cylinder itself relative to the dimensions of the new piston. Chainsaw piston

But if after inspection you find that there is no damage on both the piston and the cylinder, then the reason may lie directly in the rings (piston). To do this kind of check, you need to insert a piston into the cylinder and carefully begin to rock it using a connecting rod. If you suddenly feel play, then the rings need to be replaced, as they are already worn out.

READ How to Correctly Connect Partner 350 Hoses

Many people wonder: why does the chainsaw stall when I press the gas? The answer may also lie in insufficient chain lubrication (see chain saw oil), since the oil line may be leaking, or the direct channels may simply be clogged. That is why pay attention to the chain, because if it is dry, then without delay, start cleaning the channels that supply oil directly to the tool tire. Then inspect in detail the parts where the oil pump fittings are connected to the pipes. But if you notice that oil is leaking at the joints, or you find cracks in the tubes themselves, then in the first case, seal the leaks with sealant, and the tubes will have to be replaced.

Additional Tips

First of all, what you should remember when purchasing this kind of tool is that certain parts of the saw need to be replaced with new ones after their service life (passport) has expired. It is for this reason that the instructions should always be at your fingertips, since everything is described there in detail.

These types of parts include: a sprocket (drive), a tire, part of the system (anti-vibration), as well as a chain . Since we should not forget that if this “filling” is not replaced with a new one at the required time, then these worn-out spare parts will negatively affect the remaining parts of the chainsaw. It is for this reason that you should check the depth of the immediate tooth cutting quite often. The chainsaw stalls when the gas is pressed; the partner stalls when the saw is champion. Remember that it should not be higher than 0.5 mm a week.

To sum it up...

Definitely, every item we buy has its own expiration date and sooner or later it breaks, and it becomes a shame when the degree of its breakdown is so great that it cannot be repaired. But you must admit that quite often we simply treat technology negligently, and when it stops working, then we try to find ways to fix the breakdown, turning to a huge number of services.

But remember that even though the equipment breaks down, we can extend its “life” . All you need to do is simply take care of it and keep its parts clean and tidy. And then, undoubtedly, it will serve for many more years. It is also important to use exclusively high-quality spare parts and “additives” (see attachments for chainsaws). Then your equipment will work smoothly, and you will simply forget what repairs are.

Source

Assembling the Partner 350 chainsaw. Characteristics of the Partner 350 chainsaw

This model is in considerable demand among consumers, but most often it is bought by summer residents for work on their plots. The saw is used not only for preparing firewood, but also in construction.

In general, Partner 350 chainsaws are distinguished by their compact size. They are equipped with a fairly powerful engine. Their main advantages are easy starting and reliable operation. performed by a high-quality electronic ignition system and fuel pump.

This chainsaw is completely safe to use. It has a built-in protective system that automatically triggers the inertial brake for the chain. In the same mode, its lubrication is carried out.

There will be no problems starting the Partner chainsaw even in winter, since it has a fuel primer. The starter drum is equipped with an impeller that helps clear dirt. In addition, the manufacturers have equipped the tool with the CCS system. This design traps residual particles and is also used when using the air filter for a long time.

To increase the service life of the chainsaw, the developers made chrome-plated walls on the piston group cylinder. This model also has an ergonomically shaped handle and an anti-vibration system.