How do i remove a clutch on a stihk ts400 - Stihl Concrete Cutoff Chop Saw Clutch Ts400 Ts 400

could be fuel pipe bent/hole in fuel pipe or yes could be carb

I've added the parts breakdown, it may be able to highlight your problem better.
http://www.mediafire.com/download/8ofdmtqiszs33ot

Check the fuel tank vent, it could be creating a vapour lock in the fuel tank

the bearing on the clutch drum is probable jamed and needs replacing

Had the same problem with my Stihk hs 81 R hedge trimmers. Ive stripped it down and found that the clutch drum had sheared. Hope this helps.

seems that ur clutch is sticking.take recoil caseing of and check by turning blade by hand,if you feel the engine turning over,then your clutch drum is sticking,be sure to remove ur spark plug cap! it will be the bearing at the rear of the clutch drum,maybe a little oil and a few turns will help it free itself.hope this helps.

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.

Does it run normally until it has warmed up? Check for a spark immediately after it cuts out. This fault can be caused when the coil has deteriorated and heat from the engine causes the coil to fail.

With the TS400, the other major common failure is the main bearings leading to crankcase seal failure which will cause the machine to run lean and cut out. This can easily be check for by taking the pull cord and side covers off and checking for play by trying to move the flywheel/clutch up and down. If there is any up and down movement relative to the casing the bearings have gone.

There is no diagram. it is a simple system the coil for the plug has a kill wire that runs up to the thumb switch.
page 31 of the service manual shows the connectors.
Make sure the wires are not rubbed through.

I am a Gold certified Tech for Stihl. Feel free to ask any other questions you might have.
Jose

link to ts400 manual

Hello. No, the oil mix is designed to do all that is necessary. Stihl 50:1 two stroke engine oil or equivalent is recommended for proper operation, cheap oil does not have the additives needed too keep rings free and inhibit carbon build-up. Also do not use BIA or TCW rated oils, or any others with duel purpose ratings.

Thank you