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I have a Stihl Ts400 cut-off saw. I just replaced the piston, piston rings and Cyclinder due to no compression. Now I can't get it too fire. Need some advice on what to do now.

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Check for snappy, blue spark at the spark plug (gapped 0.020"). If ok, pour some fuel mix into the plug hole and try for start--it should pop several times. If ok, check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. You may need to clean the carburetor inside and out with spray carburetor cleaner. Check the lower chamber diaphragm for flexibility and no damage. Hope some of this helps!

Posted on Aug 02, 2010

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Why Do I Not Have Any Spark From The Ignition Module When Spark Plug is in The Cylinder


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Stihl TS400 stone cutter not working (no compression) so replaced piston rings, new gasket kit and clean for carb new spark plug (good spark when engin turned over) cleaned all air filters, replaced all...


You did not indicate whether or not you have compression now that you have changed out the gaskets and piston rings. If not, it seems to me that the problem could be a) cracked head or block, b) bad valve(s) or even c) a warped head.

Sorry for the bad news (if I am right).

Apr 23, 2014 | Stihl Ts400 Cut Off Saw Carb Carburetor...

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Which way does the arrow point on a stihl piston ts400


the arrows on all pistons face to the front of the engine

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1 Answer

Stihl ts400 quick cut won't draw fuel. New carb installed same problem exists. I am now getting beyond frustrated. It will start and run for a moment on carb cleaner but when its out of carb cleaner i


Check the boot between the carb and the cylinder, it could be an air leak. also check the compression. If the piston rings are damaged then it wont have the compression to pull the fuel through. Could also be a damaged fuel line, or plugged filter.

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1 Answer

Rebuilt a Stihl TS400 concrete saw, and now it wont cut, the engine dies down and has no power but revs up? Ive tried everything!


All these people are missing a basic thing: check the compression. If you did all thus work yourself, you may have reused the head gasket or not installed the new one correctly. It will run with no load, but once force in exerted, the pressure finds the leak and exploits it. There is a reason 2-cycle engines run at 130-160 psi normally.

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1 Answer

Put new decompression valve in , when pulling the pullcord there's no compression ,it justs jams


Check to make sure the old valve didn't have part of it fall down on top of the piston. I just had that exact thing happen to a TS400 in my shop for service.

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It is getting gas, spark and air but wont start


Does the unit have compression? A quick way to check for compression is to hold the unit up by the recoil starter. It should have enough compression to hold it self up for longer than a second before it SLOWLY lets out the starter rope. If it will not hold itself up or if it falls down quickly the unit does not have enough compression to run. This could be wear in the piston, rings, or in the cylinder. I would take it to a Gold Certified Technician from a Stihl dealership to have it repaired.
Alternately it could also be the flywheel key has sheared and it is firing at the wrong time for the unit to start and run. If that is the case then the flywheel would have to be replaced.

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Need to know belt size fo the stihl ts400 concrete cutoff saw


You should go to a Stihl dealer and ask for the belt for a TS 400 Cut Off Saw. The belt is ribbed, you should only put on a Stihl part to replace the belt and make sure the belt is under the correct tension. When you go to the Stihl dealer you can ask them to show you how to make sure the belt is under the correct amount of tension.

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