A quick compression test will help determine, again, if the source is actually compression or something else entirely. If the rope pulls out slowly, compression is probably low, as the compression should keep the rope tight. The operator needs to accurately tell if compression is causing the problems, as compression repairs can be difficult.
A cool chainsaw runs low, while a hot engine that’s been running for awhile will usually be higher. If air is leaking somewhere in the engine, you will notice a drop in compression. Check the owner’s manual of your bike for ideal engine pressure but generally speaking a healthy 250cc 2-stroke engine shows compression ranges from 170 to 240 psi and all other engine sizes between 120 and 190.
In case you are working with a remote type chainsaw like Husqvarna 545, the motor power is around 50.5cc. For a chainsaw that works around 50cc, the required compression is 140-150psi from the air compressor. The gauge number the needle will be stable at will be the indicator of the compression pressure required to run that chainsaw. Usually, the answer to the question like ‘how much compression should a chainsaw have’ is not a definite one.
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. The cold chainsaw works slowly than a hot chainsaw because the cold chainsaw has a lower compression ability than a hot chainsaw. A cold chainsaw will have a compression range of 85-100psi and a hot chainsaw will have a compression range of 160psi.
what is chainsaw compression Related Question:
What is good chainsaw compression?
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.
How do I know if my chainsaw has low compression?
A simple way to check for low compression is to place the chainsaw on the ground and use the starter rope to lift it. Good compression will prevent the rope from pulling out. You should be able to carefully lift the weight of the chainsaw by the starting cord.
How much compression does a 2 stroke need to run?
It is advisable to read between 110–130 PSI on two-stroke engines. You should still expect a great engine in these environments as compression rates have fallen below 80 or 90.
Will a chainsaw run with low compression?
Most chainsaws will operate well with compression readings that range from 100 to 160 psi. After checking the function of the starter assembly, the operator can move on to determining if compression is dropping or increasing.
Why does my chainsaw have too much compression?
Many problems with compression are related to fuel. Old or bad fuel can cause lots of headaches with yard equipment. Try draining any of the gasoline mixture left in the gas tank and add fresh fuel. If this does not solve the problem, it may be related to excessive fuel caused by problems in the gas lines and filters.
How do you increase compression on a chainsaw?
Too much or too little air intake can negatively affect engine compression. In order to increase compression in your Poulan chain saw’s Kohler engine, manually adjust the air valves via the two rocker arms under the air valve cover.
What is the best compression for a 2 stroke?
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!
Why does my 2 stroke have low compression?
The most likely reason why a two-stroke engine has lost compression is an issue with the piston or piston rings. The piston is the part of the engine that creates the compression needed to run. If there is a crack in the piston, air can escape and cause a lack of compression.
How much compression should a 435 Husqvarna chainsaw have?
Best Answer The compression in the combustion chamber of a 435 at minimum is 120 pounds per square inch. If the piston is on the upward travel when the saw is first being started, that compression has to be overcome just to get the rope to pull out and start another cycle.
How much compression should a Husqvarna 445 have?
Dry cold compression is 92 psi, so no wonder it wouldn’t start.
How much compression should a Echo chainsaw have?
Perfect Pressure According to customer service at Echo USA, the compression on the Echo 341 is should fall be no lower than 100 pounds per square inch and be no higher than 130. A cool engine will produce lower readings, while a hot engine will be on the higher end.
Why is my chainsaw hard to pull and kicks back?
If your chainsaw is hard to pull, here are some common causes: The pully system is snagged or stuck. The starter assembly is stuck or sticky. The housing may be damaged.
What is the purpose of a decompression valve on a chainsaw?
What is a decompression valve? 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.
What causes a chainsaw to kick back when starting?
There are two circumstances that can cause kickback when using a chain saw. The first occurs when the moving chain at the tip or the nose of the guide bar strikes an object. The second situation is when the wood closes in, pinching the saw chain in the middle of the cut.
Can low compression Be Fixed?
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.