Question about Stihl Ts400 Cut Off Saw Carb Carburetor Air Filter

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I bought a rebuild kit for a Stihl TS400 and the piston has an arrow on it is there a reason for the arrow

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I believe the arrow must be installed facing the exhaust.

Posted on Jun 07, 2010

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Fuel is running through carb flooding out when pulling to start


The float valve is stuck open. It's time to rebuild the carburetor.

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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).

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Which way does the arrow point on a stihl piston ts400


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Carb settings for stihl ts 400


Standard settings: screw both in fully, unscrew H screw 1 full turn anticlockwise. unscrew the L screw 3/4 of a turn anticlockwise.

Aug 14, 2012 | Stihl Ts 400 Ts400 Carburetor Carb Rebuild...

1 Answer

Hello, i have a stihl ts400 and i just rebuilt the topend(crank,piston,cyl,all bearings and seals.Fires up easy, idles fine,revs fine, but when you hold the throttle down it doesent want to hit rev limiter...


There is not an actual rev limiter. The top end is controlled by the carb. You actually want it to sound a bit rich at full throttle so that it has enough fuel when cutting under a load. What causes me some alarm is the revving up part. If it revs too fast that is a lean condition and can quickly ruin the piston and cylinder much like running straight gas. A torn intake boot can cause this. The high speed spec for the TS400 is 9,600 rpm + OR - 500 RPM. Your saw may not have a needle to adjust the high side as some have only the low speed adjuster. Also when you disassemble and clean the carb always use a new kit with the gaskets and diaphragm. Any Stihl dealer can furnish the kits and they aren't terribly expensive. Often between $10-20.

Jun 26, 2012 | Saws

1 Answer

Hi, My Stihl TS400 with 14"


Racing on a 2 cycle engine is usually a sign of a lean condition. It could be caused by a few different things including a bad crank seal or a torn intake manifold as some are made out of rubber. I would remove the cutter arm then pull the muffler to inspect the cylinder and piston. If they are scored it will be a costly repair.

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Piston of a ts400 cutquik saw is seized in the housing


What did you expect? Find a engine rebuilder and get ready to spend about 75% of a new replacement.

Jul 16, 2009 | Hand Tools

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