First thing we check is compression by feel. Most 2 cycles need a minimum of 100psi to run, some will run with less, some won't. A quick check is to pick the saw up by the recoil handle, if the saw drops thru the compression stroke, it needs serious work. Next thing is to smell/look at fuel.
How do you check the compression on a chainsaw?
First thing we check is compression by feel. Most 2 cycles need a minimum of 100psi to run, some will run with less, some won't. A quick check is to pick the saw up by the recoil handle, if the saw drops thru the compression stroke, it needs serious work. Next thing is to smell/look at fuel.
How do I know if my Chainsaw is bad?
A quick check is to pick the saw up by the recoil handle, if the saw drops thru the compression stroke, it needs serious work. Next thing is to smell/look at fuel.
Why won't my Stihl Chainsaw start?
Stihl saws were having problems with scoring. They need a new piston, rings and cylinder. They do make aftermarket parts for less money. Ebay has sets for under $100. A friend had a saw that just would not start. It seemed to have compression, but just not enough. Take off the muffler, look inside if its scored, its done.
How much psi does it take to run a chainsaw?
Most 2 cycles need a minimum of 100psi to run, some will run with less, some won't. A quick check is to pick the saw up by the recoil handle, if the saw drops thru the compression stroke, it needs serious work. Next thing is to smell/look at fuel. Regular 87 octane is pretty much garbage. I have been recommending 89 and now 91 octane fuel only.
What does it mean when a Stihl chainsaw starts up?
What do you need to replace a Stihl piston?
What is the diameter of a Stihl 180 chainsaw?
What are the main malfunctions of the Stihl Ms 180 chainsaw?
How is a chainsaw engine mounted?
How to check if piston ring is elasticity?
How to remove chainsaw stoppers?
See 2 more
How do you do a compression test on a chainsaw?
0:172:10Compression Test of HUSQVARNA 55 Chainsaw - YouTubeYouTubeStart of suggested clipEnd of suggested clipNow always remember to do your compression test with the engine cold and remember to always hold inMoreNow always remember to do your compression test with the engine cold and remember to always hold in the throttle wide open to allow more air to go into the engine. Now just screw in your compression.
What is good compression on a 2 stroke chainsaw?
between 110 to 130 PSIHow much compression does a 2-stroke chainsaw need to run? It's advisable that a 2-stroke chainsaw maintain a compression reading of between 110 to 130 PSI.
Does a Stihl chainsaw have a compression release?
To make starting the STIHL 4-MIX engine easier, the engine has been fitted with a decompression system which extends the valve opening times when starting.
How do you do a compression test on a 2 stroke?
5:556:34How to Compression Test 2 Stroke Engines - YouTubeYouTubeStart of suggested clipEnd of suggested clipCompletely stops. And kick it hard the entire time bring the kit cover all up the top of the strokeMoreCompletely stops. And kick it hard the entire time bring the kit cover all up the top of the stroke each time to where you get a full swing out. And kick it hard that's all it takes.
How do I know if my 2 stroke has low compression?
2 Stroke low compression symptomsLow power.Hard to start.Plug fouling.Bogging.Sputtering.
What compression should a 2 stroke engine have?
Two-Stroke engines should have a compression reading of around 110-130 PSI. Sometimes having compression as low as 80 and 90, the engine will still run great!
How does a decompression valve work on a Stihl chainsaw?
A decompression valve releases some of the compression from the combustion chamber during the starting procedure, making the engine easier to turn over when pulling the recoil rope.
Does a Stihl ms250 chainsaw have a compression release?
The Stihl MS 250 C compression release will need to be replaced if it is broken or has significant carbon build-up. Carbon build-up can result from too much oil in the gasoline [mixed rich] or from using fuel of poor quality [fuel that has become stale].
How do you start a Stihl chainsaw with a decompression valve?
2:104:06Chapter 9: Starting Your STIHL Chainsaw - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd pull until you feel slight resistance. At this point give the Rope a sharp brisk pull and thenMoreAnd pull until you feel slight resistance. At this point give the Rope a sharp brisk pull and then guide the rope back slowly into the starter housing.
Will a 2 stroke engine run with low compression?
A small 50cc and 65cc 2 stroke dirt bike should have a minimum compression of 120 PSI to run properly. Good compression is about 150 PSI. An 85cc 2 stroke dirt bike should have a minimum compression of 130 PSI to run well.
What causes low compression in a 2 stroke engine?
Worn piston rings can cause incomplete sealing, resulting in lower compression and more difficulty in starting. Worn piston rings or reed valves that are no longer sealing properly may be the cause of the poor startability characteristic.
How do you fix low compression?
If you discover you do have low compression, the only solution is to replace the leaking part whether it's the piston, piston ring, camshaft, head gasket or valves.
How much compression should a chainsaw engine have?
According to Stihl USA, the minimum compression reading for their chainsaws should be around 110 psi. Some individual engines may run a bit higher or lower and the temperature of the tool can affect readings.
What does higher compression do on a 2 stroke?
Increasing the compression ratio of a two-stroke motor certainly improves the theoretical efficiency of engines. In practice, however, it is not a matter of simply “skimming” the head as you would with a four-stroke engine.
What causes low compression on a 2 stroke?
Worn piston rings can cause incomplete sealing, resulting in lower compression and more difficulty in starting. Worn piston rings or reed valves that are no longer sealing properly may be the cause of the poor startability characteristic.
How do I get more compression out of my 2 stroke engine?
Remove the cylinder head, under the head, sitting on top of the liner there should be some shims in the form of rings. There may be just one or several. Reducing the thickness of this shimstack will give higher compression. On an average sport type engine you will notice little if any difference.
What does it mean when a Stihl chainsaw starts up?
It is considered a normal indicator at which the Stihl chainsaw starts up regularly and gives out maximum power, if the compression is lower, there is a chance that there are scuffing on the piston-cylinder group or its wear is quite large.
What do you need to replace a Stihl piston?
It is also necessary to have a small slotted screwdriver, a special Stihl combination wrench, a power screwdriver, a hammer, a drift of soft material, a compressor and a stopper for the Stihl piston.
What is the diameter of a Stihl 180 chainsaw?
On a Stihl 180 chainsaw, the piston group has a diameter of 38 mm. The dimension of the CPG of the chainsaw is determined by the diameter of the piston, the cylinder is slightly larger. As standard, the MS 180 CPG comes complete with a piston pin, two piston rings, and two retainer rings.
What are the main malfunctions of the Stihl Ms 180 chainsaw?
The main malfunctions of the Stihl ms 180 chainsaw are associated with the piston group. Consider the main reasons why the piston must be replaced. Let us give a description of the piston and the algorithm for its replacement.
How is a chainsaw engine mounted?
The crankcase is mounted on the engine, sealant is used as a gasket, after which four mounting screws are mounted and tightened crosswise. Next, the engine is mounted on the chainsaw body. Subsequent assembly is performed using the reverse disassembly algorithm.
How to check if piston ring is elasticity?
To determine the presence of seizure on the piston, as well as the breakdown of the piston ring, you can remove the muffler and conduct a visual inspection of the visible part of the piston, while the rings can be checked for elasticity by pressing on them with a small screwdriver. There will be slight walking on the working rings, the defective or pinched piston ring will not go.
How to remove chainsaw stoppers?
Using a power screwdriver, the stoppers are removed from the shock absorbers of the chainsaw, after which its handle is disconnected from the body.
How much compression should a chainsaw have?
There is no definite answer to this question that How Much Compression Should A Chainsaw Have? You have to understand the compression level for your engine and the requirements of your chainsaw or do the pressure test to measure the compression needed to run the chainsaw.
How to test pressure on chainsaw?
You can test pressure effectively with a basic pressure testing measure. Eliminate the spark plug by utilizing a wrench and spot the measuring gauge in its place. Gauges come in different sizes, so you might have to utilize a connector between the measuring gauge and Chainsaw. In any case, the seal between the two should be tight to get an exact perusing. Pull the starter rope a couple of times until the needle of the gauge stops going here and there. The gauge number the needle chooses is the right perusing.
What is the compression range of a chainsaw?
A cold chainsaw will have a compression range of 85-100psi and a hot chainsaw will have a compression range of 160psi. The minimum pressure level for 2 stroke engine that is used in chainsaws should in the range of 100 to 160psi. According to the standard system about chainsaw the range of compression ability is between 90 to 100psi. Each model of chainsaw does not have the same motor capacity.
How does a chainsaw work?
Proper pressure and compression are required for chainsaws in the 2-strokes engine for the fuel ignition. A two-cycle engine works with just a single-piston of cylinders. The cylinder piston goes here and there inside a shaft. On the main stroke, the air is compacted on one side and fuel is sucked in on the other. On the subsequent stroke, the fuel is lighted and ignited on the bottom, and exhaust is pushed out the top. The compressed air from the principal stroke makes a vacuum that pulls in the fuel. Without appropriate pressure, fuel can’t get sucked into the engine.
What is the pressure of a compressor?
For a trimming tool named chainsaw that works around 50cc, the necessary pressure is 140-150psi from the compressor of air. In the event that you go a higher cc engine, for example, 60cc, you may require a pressure of 160cc from the air compressor.
What is the minimum pressure needed for a chainsaw?
For a 2-stroke engine, the minimum pressure level is within 100-160 psi, and maintaining the level within the range of 90-110 psi is usually recommended. Therefore, the ideal compression measurements for the 2-stroke engine is 110 psi.
What type of engine is used in a chainsaw?
Chainsaw contains two types of engines, 2-stroke engines and 4-stroke engines, and the engine uses gasoline as its fuel. The compression varies according to the model and brand of each chainsaw. If a chainsaw has a small engine, it requires a small amount of compression, and if a chainsaw has a large engine, it will require a large amount of compression for running the chainsaw.
How much compression does a chainsaw need?
If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Similarly a 4 stroke engine needs 2 times more compression than the 2 stroke engine that is around 180-210 PSI.
What is a compression gauge on a chainsaw?
A compression gauge is used to measure the compression of a chainsaw which works similar to the tire gauge.
What is the difference between a heavy duty chainsaw and a chainsaw with a smaller engine?
A heavy-duty chainsaw requires a large amount of compression whereas as a chainsaw with smaller engine needs less compression to convert fuel into energy.
Why does my chainsaw have high compression?
The other cause of your chainsaw’s high compression could be the stuck ignition rope. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. Your ignition rope must be intact properly with the pulley to work correctly. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage.
How much power does a chainsaw have?
A large engine has a huge capacity in its motor. It is obvious that the motor which has huge capacity will require more compression. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC.
Why is my chainsaw cord so hard to pull?
Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull.
How to check starter spring?
It is effortless to check the starter spring; pull the ignition rope. If it is hard to pull, then check how the spring is performing. If you see any unusual movement of spring, then take it in to replace it.
Where is the muffler on a piston?
Pull the muffler off if it is scored you will see it on the exhaust side of the piston. Also Crankcase seals can go out.
How much pressure should a fuel line hold?
We dump the fuel, and pressure check the fuel line. It should hold 7psi. I have seen saws that were 3 years old have lines rotted off.
What is the least common problem with carb intake boot?
Finally an air leak in the carb intake boot, or crank seals would be the least common problem.
Can you pull over 084 compression?
On the 084 compression : I rare ly try to test for a high number - it's way too hard to pull over the 121cc 084 and 088. If I make to to the point where you can't pull any more (130-140) - it's fine. Testing with the decomp valve in is of course invalid.
Do Stihl saws need a new piston?
Stihl saws were having problems with scoring. They need a new piston, rings and cylinder. They do make aftermarket parts for less money. Ebay has sets for under $100. A friend had a saw that just would not start. It seemed to have compression, but just not enough. Take off the muffler, look inside if its scored, its done.
What does it mean when a Stihl chainsaw starts up?
It is considered a normal indicator at which the Stihl chainsaw starts up regularly and gives out maximum power, if the compression is lower, there is a chance that there are scuffing on the piston-cylinder group or its wear is quite large.
What do you need to replace a Stihl piston?
It is also necessary to have a small slotted screwdriver, a special Stihl combination wrench, a power screwdriver, a hammer, a drift of soft material, a compressor and a stopper for the Stihl piston.
What is the diameter of a Stihl 180 chainsaw?
On a Stihl 180 chainsaw, the piston group has a diameter of 38 mm. The dimension of the CPG of the chainsaw is determined by the diameter of the piston, the cylinder is slightly larger. As standard, the MS 180 CPG comes complete with a piston pin, two piston rings, and two retainer rings.
What are the main malfunctions of the Stihl Ms 180 chainsaw?
The main malfunctions of the Stihl ms 180 chainsaw are associated with the piston group. Consider the main reasons why the piston must be replaced. Let us give a description of the piston and the algorithm for its replacement.
How is a chainsaw engine mounted?
The crankcase is mounted on the engine, sealant is used as a gasket, after which four mounting screws are mounted and tightened crosswise. Next, the engine is mounted on the chainsaw body. Subsequent assembly is performed using the reverse disassembly algorithm.
How to check if piston ring is elasticity?
To determine the presence of seizure on the piston, as well as the breakdown of the piston ring, you can remove the muffler and conduct a visual inspection of the visible part of the piston, while the rings can be checked for elasticity by pressing on them with a small screwdriver. There will be slight walking on the working rings, the defective or pinched piston ring will not go.
How to remove chainsaw stoppers?
Using a power screwdriver, the stoppers are removed from the shock absorbers of the chainsaw, after which its handle is disconnected from the body.
