How to correctly put the piston on the grass trimmer

TrueShopping BC4902 two Stroke Engine Piston and Cylinder Replaced. Due to was running on Fuel Only

Common malfunctions of electric trimmers

Electric grass trimmers differ from gasoline-powered devices in a more simplified design. Conditionally, an electric trimmer is divided into a mechanical and electrical part. Accordingly, there are the same groups of problems occurring with this equipment.

Most breakdowns cannot be visually detected. For this purpose it is necessary to use various devices. The following can be visually detected:

  • The power cable is broken (the insulation is torn off or it is clearly broken);
  • Blockage or jamming of the starter button
  • Mechanical external damage to the grass trimmer;
  • problem with the cutting part;
  • stopping the grass trimmer when clogged with grass;
  • damage to the fork.

To find out which part is broken in the other cases, you will need to disassemble the electric lawnmower and check the most likely options one by one. In this case, pay attention to external manifestations of deviations from the normal operation of the device. They help to determine the cause.

Repairing an electric grass trimmer will require the following devices and tools:

Electric grass cutters often do not work for reasons not directly related to them, but caused by undervoltage in the network or a bad condition of the socket used.

installing the piston on a 4T scooter

Take a new set of pistons for 72 or 80cc (piston diameter 47mm or 50mm respectively). You can, of course, use the standard 50K new cylinder head. Kit includes: cylinder, piston, piston rings, piston pin, snap rings, as well as head and cylinder gaskets. You can buy the 72cc cylinder head at a low price in our online store.

Install in reverse order, pre-lubricating the cylinder, piston and rings with a little oil. Install the thin ring on the piston, first in the bottom groove, then the slinger and then the thin ring again (the wavy ring. the slinger will thus be between the two thin rings in the bottom groove). Here we install the two compression rings (the thicker ones). The cuts on all rings must not be on top of each other. After installing the rings, put the piston on the crankshaft connecting rod, fix its position with the pin and snap rings. Take the connecting sleeves from the old cylinder and put them into the new one.

Put a cylinder gasket on the studs

Carefully put the cylinder on the piston and rings so as not to damage the cylinder. Push the chain into the chain slot

Then install the chain rail to the cylinder head. Now we can put the chain on the sprocket of the camshaft (position of the sprocket in this case should be the following: the large hole at the top and two small holes on the sides, parallel to the edge of the cylinder head). Fix the cylinder head and gasket by screwing them in. Then install the plastic cylinder head cover, chain tensioner, carburetor and muffler. That’s the end of the installation!

If you haven’t changed the oil in a while. change it before you start with the new piston. Before you put a full load on the scooter engine, you need to go through a running-in period, t.е. drive 300-500 kilometers at a speed of no more than 40-45 km per hour.

Together with the increase in power of scooter with the installation of tuning-tspg increases load on the variator with gearbox gears. Keep this in mind and if possible replace the variator with a gear reducer gears for tuning (more reinforced.)

How to put the right piston on the trimmer for grass

Repair of such a level should always be weighed. In such small engines, working at high RPM, replacement of the 1st piston, which burned out or jammed, does not work long and if necessary, you need to change the whole piston group. ” How to properly put in a chainsaw or trimmer. The piston is a good match for the piston. So you need to think about whether to use this saw further or buy the newest saw.

If this prof model, then such a repair is worthwhile, but if it is an ancient domestic model such as Husqvarna 40, and she worked for more than 10 or 12 years, it is unprofitable to repair. So how much will it cost to repair it? The same as buying the newest saw, let it not Husqvarna, but the PARTNER P350XT CHROME, price 165 will suffice for sure. over, such saws are sold by Husqvarna, because PARTNER is its affiliate.

But if you did decide to repair the chainsaw or trimmer for grass, you need unique parts that are not cheap. If the engine is properly operated, the first repair may not come soon and will only have to change the piston ring or rings, depending on the model. But if the saw got jammed it is necessary to change all piston group. cylinder, piston and rings.

You should see that Husqvarna 136/141 chain saws have about 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws more than 2000-2500 hours, subject to serious observance of the instruction manual. In fact, you can not rely on these numbers, because the actual life can vary significantly in a huge, as well as in the smallest way. But approximately we can say that the semi-professional saw works 3-4 times longer than amateur, and prof. up to 10 times and more.

Naturally, nothing is infinite, but it is one thing if you change the piston group after years of use and it has worked its hours and paid for itself, and another thing if you fill up the saw with gasoline without oil and it jams. This saw has to be repaired because all the other parts are common.

Many companies deliberately inflate the price of spare parts to buy new models. At chainsaws and trimmers for grass, for example, by STIHL, spare parts are available in a greater range, if on Husqvarna. So when choosing a certain model find out what the spare parts situation is.

How to properly install the rings on the piston on a two-stroke scooter

The main thing is to install the rings on the piston of a two-stroke scooter as well as on a four-stroke scooter is not that complicated, and this is clear to many people. But most of the scooterists who have just not so long ago got a similar technique, do not even have an idea about how to change the piston on a scooter, how to properly install the rings on the piston, where should look arrow on the piston and almost everything else. In this lesson, I’ll tell you how to put the rings on the piston and reassemble the piston in place. Because we’ve already said earlier about the four-stroke engines, here we will talk about two-stroke engines.So, our piston is worn out and needs to be replaced. The piston shows and tells how to install the piston in the cylinder on a scooter and motorcycle. How to put a piston on a scooter in this lesson, I will tell you how to correctly put the rings on the piston and assemble the piston in place.The rings wear out first. Wear first of all rings and a piston, and to change usually need only them. If the piston is very worn, you need to bore the cylinder. It is also undone when the piston is stuck in the cylinder and causes deep scratches on the cylinder wall. There’s nothing wrong with that, and if your new cylinder has been properly bored (for which you’ll only have to shell out about 10), it will already need a repair set of rings with a new piston. These rings are identified by the 0.25. The second bore is 0.5 and t, respectively.д. to unity.

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After buying a piston, it needs to be assembled. In the kit, as a rule, you will find a piston itself, two compression rings, a third thin crimp ring (its purpose. see below), piston pin and two piston pin retaining rings

How to Change a Piston on a Trimmer.

In this video I will show how to independently, quickly change the piston on a trimmer. I will change it on a trimmer.

How to install the piston correctly

Pridonok shows and tells how to properly install the piston in the cylinder on the scooter and motorcycle

The Correct Way to Point Piston Arrow On A 2 Cycle engine

Now for the third ring in the kit. Its purpose is to give a spring to the lower compression ring. It is set under it actually, and usually not of any use during operation. This ring you can throw out, and you can put in, there is no difference. How to properly install the piston on a chainsaw. Many piston manufacturers do not come with one at all.

It’s time to reassemble everything. Depending on the scooter model, the compression rings may be the same or differ in thickness and cross section. Most Honda scooter pistons, for example, have different rings, where the upper is thinner than the lower and has a different cross section.

This is something to pay attention to when you install it, the top one is thinner and beveled at an angle.

Also pay attention to the inscription on the ring (usually a letter T or repair size), the inscription should always be on top, that is opposite of the finger. You have to put the lower one on first, then the upper one. They do not need to be stretched and bent. These manipulations have to be done carefully.

There are locks in the grooves for the rings to prevent rotation of the rings during operation, so the ring gap must be in these locks, otherwise you will not stick the piston in the cylinder.

And the last important point, the arrow (1) on the bottom of the piston or the EX inscription. Both the arrow and the lettering must point towards the exhaust (2). In this case, the ring locks will be on the side of the petal valve. How to correctly install the piston on a chainsaw. How to use the chainsaw? If the locks are placed towards the exhaust, the piston will not last long, the rings will be pulled into the exhaust window and gradually wear it down.

How to Properly Install the Piston on a Chainsaw

Breakdowns can be planned or emergency. Planned failure depends on the manufacturer, materials of manufacture of the group, intensity of use. It is usual to calculate the life of a chainsaw in engine hours. After working out the allotted number of hours, you should give the tool for repair for preventive maintenance of the engine.

  • operation at increased loads, not comparable to the power of the tool;
  • Lack of proper maintenance, which leads to dry running of the motor and increased wear;
  • The use of low-quality fuel, which does not give the engine stable operation;
  • The age of the saw is high, despite the low intensity of use.

Each start of the tool is a certain amount of stress on the piston and cylinder. So the number of starts also determines the life of the device. If you notice extraneous sounds from the motor, reduced power, increased consumption, it is time to give the equipment for preventive repair in the service center.

How to install the piston in the grass trimmer cylinder

All my attempts to find out what model it is and what years it was made were in vain (I would be VERY grateful if you could help me in this matter). Nevertheless, I can roughly assume that it is somewhere in the 60’s and 70’s of the last century. The chainsaw uses a CONTACT ignition from Bosch.

The number 21554 is stamped on the crankcase. What this number is, is a mystery to me.

On the left side of the saw is a plate that reads.

What information is on it for me. dark forest :-))).

I partially disassembled the chainsaw (to clean and assess the condition of parts). I also replaced the spark plug tip (it cracked everything) and installed an ignition switch (it was missing when I bought the saw). This information is not known to be original :-))). And one more disadvantage. no oil tank cover. (Everything is marked with arrows in the photo).

There is a chain on the saw. TAKASAGO (I’ve never heard of it, but the inscription on the cutting tooth shows it).

DOLMAR chain saw. About three or four months ago I had this replica of a Dolmar chainsaw in my hands.

Disassembly. STIHL MS180 chain saw assembly. Successful application: 21.43% Message text fragments. Disassembly. STIHL MS180 chain saw assembly. Dismantling STIHL MS180 chain saws. STIHL MS180 chainsaw assembly.

Replacing the piston group with a chainsaw or trimmer

Repairs at this level should always be balanced. In such small, high-speed engines, replacing a single burnt or stuck piston doesn’t last long, and if necessary, the entire piston group must be replaced. So you need to decide whether to continue using this saw or buy a new saw.

If it’s a professional model, such repairs should be made, but if it’s an older household model, such as the Husqvarna 40, and it’s been running for more than ten or twelve years, it’s not profitable to repair it. Since it will cost as much to repair as to buy a new saw, albeit not Husqvarna, but on the PARTNER P350XT CHROME, the cost of 165, of course, is quite sufficient. Also, Husqvarna sells these saws because PARTNER is its subsidiary.

But if you do decide to repair your chainsaw or grass trimmer, you need original parts, which are not cheap. If the engine is running normally, the first repair may not happen soon, and only the piston rings or rings can be replaced, depending on the model. But if the saw is stuck, the entire piston group needs to be changed. cylinder, piston and rings.

It should be noted that Husqvarna 136/141 chain saws have a life of about 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws at least 2000-2500 hours, provided that the operating instructions are strictly followed. In fact, these figures should not be relied upon, since the actual service life can vary significantly up and down. But we can roughly say that semi-professional saws last 3-4 times longer than amateur saws, and professional. up to 10 times or more.

Where the arrow on the piston points

Due to the fact that the pistons have the correct cylindrical shape, after extraction, many inexperienced masters are confused about how to put them back in place correctly.

correctly, piston, grass, trimmer

the pistons in modern internal combustion engines have a very strict position, so the arrow always points in the direction where the exhaust gases are moving. If you still have questions, the garden tool has an instruction manual. Even if it is in English it is easy to translate.

How to check the serviceability of a magneto

The magneto is the main part in the engine ignition system and is a coil with the primary and secondary windings located around the core. Often due to a faulty magneto the spark is lost on the spark plug, and the fuel does not ignite. To check the coil, you will need to use a tester, and perform the following steps.

  • On the tester, having switched to resistance measurement mode, you must set 200 ohms. The primary coil will be checked with this method.
  • Connect one electrode of the tester to the coil “mass” and the other to the contact going out of the magneto. Normally, the resistance should be between 0.4 and 2 ohms.
  • To check the secondary winding, you will need to set the instrument switch to 20 com. Further, one probe of the device is inserted into the cap of the plug, and the second is connected to “mass”. Normally, resistance readings should be in the range of 4 to 6 com and higher (depends on the model).
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Instrument will indicate infinity if the circuit is open and 0 (zero) if it is short-circuited.

If you do not have a tester, you can use the following method, being very careful not to let the electrode touch the cylinder, otherwise the coil will burn out.

  • Remove the cap from the spark plug. The plug does not need to be unscrewed to keep the compression.
  • A nail without a cap should be inserted in the cap. The nail has to have such a diameter that it is well supported in the cap.
  • Tie the cap with a nail to the cylinder using dielectric so that the clearance between the electrode and the cylinder body is between 5.5 and 7 mm (but in no case touching the “mass”).
  • Use the starter motor to simulate starting the engine several times. The ignition button must be on.
  • Observe whether a spark appears and what color it is.

Normally, the spark should be strong, white or have a bluish tint. If the spark is weak and its color is orange or yellow, it indicates a defective magneto.

Also consider the fact that sometimes the magneto can give a good spark when it is cold. But after heating, due to internal faults, it stops producing current. As soon as the coil cools down, the grass trimmer starts up again and runs for a while until the magneto warms up again. Such a coil needs to be replaced.

Sometimes it is the spark plug that can cause the same problem with heating, even if the coil is good, so both parts should be checked.

Piston requirements

A single or two-stroke motorcycle engine produces a great deal of heat when the fuel-air mixture burns. Under its pressure, the piston moves downward, and the temperature in the cylinder reaches extremely high levels.

Engine parts that are constantly operating in harsh conditions must be resistant to overheating, high contact loads and the mechanical effects of the reaction from the connecting rod.

These properties are difficult to achieve with construction materials alone, which is why automotive component manufacturers use special sliding coatings for pistons, liner walls and other engine parts.

Over the course of time the factory protective layer wears off and needs to be renewed. For this application special formulations based on solid lubricants. antifriction solid lubricant coatings. can be used.

One of the most effective materials designed to be applied to piston skirts is MODENGY For Engine Parts. This coating reduces the wear and tear of the parts as a result of friction and prevents burrs. Compound helps reduce engine noise, increase engine efficiency, and reduce fuel consumption.

In addition to pistons, it is possible to treat shaft liners, splined joints, valve rods, throttle valve.

To ensure the best adhesion and long life of the coating, the manufacturer recommends cleaning and degreasing the surfaces with a special cleaner-activator MODENGY before the application.

How to Install a Piston on a Grass Trimmer

How to put the right piston on a trimmer

Replacing the piston group in a chainsaw or trimmer

Repair of such level should always be weighed. How to Fit the Rings on a Two-Stroke Piston In the installation of the rings on the piston. In such small engines operating at elevated speeds, substitution of 1-st piston that has burned out or jammed, gives no long result, and as the need to change the entire piston group. So you need to think about whether you want to keep using this saw or buy a new one.

If it’s a professional model, this repair is worth doing, but if it’s an old household model like Husqvarna 40 and it has worked for more than ten or twelve years, it’s not worth repairing. Because its repair will cost that much. If you buy a new saw, it may not be a Husqvarna, but the PARTNER P350XT CHROME, priced at 165, will definitely be enough. over, such saws are sold by the company Husqvarna, because PARTNER is its affiliate.

But if you did decide to repair chain saw or grass trimmer, then you need original spare parts, which are not cheap. If the engine is used properly, the first repair may not come soon and you will only have to replace the piston ring or rings, depending on the model. But if the saw is jammed it is necessary to change all piston group. cylinder, piston and rings.

It should be noted that chainsaws Husqvarna 136/141 have approximately 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws have at least 2000-2500 hours if the instruction manual is followed strictly. In fact, you can not rely on these figures, because the actual life can vary significantly up and down. But approximately we can say that semi-professional saws last 3-4 times longer than amateur saws, and professional saws work up to 10 times longer and more.

Of course, nothing is set in stone, but it is one thing if you change the piston group after years of use, and it worked its motor-hours and paid off, and another thing is that the saw was filled with one gasoline without oil, for example, and it jammed. Such a saw has to be repaired because all other parts are normal.

Many companies purposely inflate the cost of spare parts to buy new models. For example, chain saws and trimmers for grass, by STIHL, spare parts are available in a wider range than for Husqvarna. So when choosing a certain model, know what’s the deal with spares. RVT

How to properly install the rings on the piston of a two-stroke scooter

In the installation of the rings on the piston of a two-stroke scooter, as well as a four-stroke, there is nothing difficult, and many people know it. But the majority of scooters, who have just recently acquired a similar technique, do not even have an idea about how to replace the piston on a scooter, how to properly install the rings on the piston, where should the arrow on the piston and much more. In this tutorial, I will tell you how to put the rings on the piston and reassemble the piston. Since before we have already talked about four-stroke engines, here we will talk only about two-stroke engines.So, our piston is worn out and needs to be replaced. First of all the rings and the piston wear out, and usually only they need to be replaced. If the piston is very worn, you have to re-bore the cylinder. It is also parted when the piston is jammed in the cylinder, creating deep scratches on the walls of the latter. There’s nothing wrong with that, and if your new cylinder has been properly bored (for which you’ll only have to shell out about 10), it will already need a repair set of rings with a new piston. Such rings are labeled 0.25. Second boring respectively 0,5 and t.д. up to one. After buying the piston, it needs to be assembled. In the kit, you will usually find the piston itself, two compression rings, a third thin crimp ring (its purpose later), piston pin and two piston pin retaining rings

How to Change a Piston on a Trimmer.

In this video, I show you how to change the piston on a trimmer on your own, quickly. How to properly install rings on a two-stroke scooter piston Published 25.08 I will change it on the trimmer.

  • SoyuzBelAgro : Polish rotary mower SoyuzBelAgro : Polish rotary mowerAuthor: Alexey IvanovPublished: June 10, 2020. 406How about me: 29I didn’t like it: 5Selling mini-equipment, spare parts service. Delivery in regions. Phone 8-8342-230017 Sarah.
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Today a variety of materials are used for finishing walls. Their choice is so great that it is difficult to make a decision. And each material has certain properties. They are worthy of consideration. In some cases only the plastic panels are relevant.

How to put the piston on properly

Pridonok shows and tells you how to properly install the piston

into the cylinder on the scooter and motorcycle Now for the third ring in the kit. Its function is to cushion the lower compression ring. It is actually installed underneath it, and is usually of no use in operation. This ring you can throw away or you can put in, there is no difference. Many piston manufacturers don’t have one in the kit at all. It’s time to put everything back together. Depending on the scooter model, compression rings may be the same or vary in thickness and cross section. Most pistons for Honda scooters, for example, have different rings, where the top one is thinner than the bottom one and has a different cross section.

This is something you must pay attention to when installing, the upper one is thinner and beveled at an angle.

Echo Trimmer Repair – How to replace the Piston Ring

Also note the inscription on the ring (usually a T or repair size), the inscription should always be on top, i.e. opposite of the pin. Put the lower one on first, then the upper one. There is no need to stretch and bend them. This has to be done carefully.

In the grooves for the rings there are locks that prevent the rotation of the rings during operation, so the gap rings should be in these locks, otherwise the piston in the cylinder you will not stick.

And the last important point is the arrow (1) on the bottom of the piston or the EX inscription. Both the arrow and the inscription must be pointing towards the exhaust (2). In this case, the rings locks will be on the petal valve side. If the locks are put in the exhaust side, the piston will not last long, the rings will be pulled into the exhaust window and gradually wear it down.

For all the manipulation with the piston, you must put a rag in the crankcase window to prevent anything from getting there, we need the crankshaft and bearings.

When installing the piston pin, pay attention to the condition of the cage (bearing), it may need to be replaced. Before installing the piston pin, place the retaining ring on one side before installing the piston (usually the side where you cannot easily insert the pin and second retaining ring). Then place the pin with the bearing and the second circlip, it will give a certain click when it locks in the groove.

That’s all, now put on the cylinder, not the piston (don’t forget to check the state of gaskets and lubricate the piston and the cylinder walls with engine oil), the cylinder head and tighten the bolts alternately in a crosswise order.

Tips for repairing the MTD-600 grass trimmer.

Today I want to share some useful information about grass trimmer repair, which I was kindly provided by our reader Yuri. With his consent, I publish this, in my opinion, very useful information.

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When and why do I need to replace a worn chainsawThe drive chain sprocket or chainsaw is one of the most important parts of a saw. The main function of the chainsaw sprocket is to transmit engine torque to the dust chain. This re.

I will share how I repaired the grass trimmer MTD-600 (ignition problems), maybe someone will need.

At the beginning it is not clear, grass trimmer just does not start, not even sneezes.

How to choose the right piston for a chainsaw. I checked the compression (to rule out mechanical failure in the cylinder, rings, connecting rod, etc.).). the compressor shows after a couple of jerks 10 bar. it is enough, the cylinder-piston-rings are in order.

Gasoline is fed through the carburetor. the spark plug is wet, and the top of the piston is wet.

The plug is clean, the gap is 0.6 mm. Spark goes during cranking. unscrewed spark plug (its threaded skirt) and connect temporarily with a wire to the cylinder and crank the starter. everything is fine.

We have compression, we have gas, we have spark, but we won’t start. it means we have problems with ignition (ignition advance angle). But the ignition timing is not adjustable on trimmers/ chainsaws, similar two-strokes! Therefore dismantle grass trimmer. take away the engine from the shaft with the starter. Opens magneto. a coil with two leads-contacts and with two “cheeks” of the core, which at some point are closed by a magnet built into the flywheel for which the starter is clinging when cranking. It was found that this short circuit (it is visible. it is the alignment of both ends of the magneto core with such well defined areas of the magnet in the flywheel, the clearance there is a fraction of millimeters, while in other positions of the flywheel over the magneto several millimeters remain) does not coincide with the “vmt” (top dead center) of the piston (this point is easily found by turning the shaft, watching the piston in the hole where the plug is twisted out).

There’s the breakage! The magneto should lock somewhere near “vmt”, and it locks when the piston goes somewhere down! Unscrew the nut holding the flywheel to the cone shaft. It turns out: The pin that fits into the grooves on the outside taper of the shaft and on the inside taper of the flywheel and that rigidly connects them in one position is sheared. Flywheel “turned”. Most likely, someone with too much crap ripped the starter, and ripped the flywheel, knocking the ignition (trimmer for grass American, should be easy to start and a child, the force is not needed, but there are tractor drivers with experience starting a diesel starter, for them, this technique is soft).

If there is no standard pin, you have to make it yourself: a small plate with the curved letter “U”, so it would go into two slots in the handwheel with its “horns” and with its curved part in the wide groove on the conical shaft. Experimentally picked up its size so that the handwheel went down on the shaft and securely locked.

We check conjunction of magneto and “vmt”, tighten the flywheel nut, assemble the weed trimmer and start it as instructed.

Many thanks to Yuri for such useful information!

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