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Not being facetious here... change the spark plug as a first step. They require regular replacement. If that doesn't work, use a multimeter to check that the spark plug wire is actually releasing electrical pulses. If it isn't, you'll need to keep moving further up the line to the coil.
Most handheld power tools have a tank vent that will hold some pressure, Don't quote me. But If I turn the saw sideways and the vent allowed fuel to drain out THIS WOULD CREATE A FIRE HAZARD. If the fuel is boiling when you open the fuel cap could this be a engine temperature problem? or low octane fuel.
I will need more information. Will the chain stop if touched to a log? Is it just creeping along compared to the speed of the motor or matching the speed of the motor? Has the saw been used enough to have saw dust build up inside the clutch and keep it engaged?
An IPL for a CS4400 Chainsaw can be found here (there are multiple IPLs, please ensure this is your saw): EchoUSA http://www.echo-usa.com/documentation.asp?Model=cs4400&lang=E
There is no sigle illustration of all oiler components, they appear on multiple illustrations.
From the IPL it has an outboard clutch, it appears the oil pump is behind it. Use this a guide for clutch removal: R² Drive Link Outboard Clutch by Drivelink.blogspot.com http://www.youtube.com/watch?v=cdqkIuVNUQc
Check the IPL for your saw to see if any special tools are needed. Poulan (Craftsman, Jonsered, Husky) clutch removal tool part number 530031112 if needed, is under $5 from many sources (look at the visible area between the weights if 2 small round sockets are visible you need the tool).
There are metal piston stops available, when square (almost never) with the piston top these work well, if not square they have been known to punch through the piston. I suggest a length of nylon rope (nothing left behind) be used instead of the piston stop (retain 6" ± so you can remove it). Make sure the piston is near the top of the cylinder before feeding the cord or it can fall through the exhaust port and damage the piston as it rises.
Everyone I have ever removed had a left handed thread (tighten it to loosen it).
You can reply below with any questions if you need additional help. I hope you found this most helpful. Lou
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