Question about Stihl Ts400 Cut Off Saw Carb Carburetor Air Filter
Hi I recently rebuilt my TS400, put in new main bearings, new oil seals, crank was ok, new little end bearing, new piston crown, new rings, cylinder was ok, renewed all gaskets, fitted new carb, new air filters, new fuel filters, new plug, new (2nd hand) flywheel (as old one had timing held in with a nail) and ive adjusted the carb as everyone says to, but I still cant get it to cut, the unit starts, idles and revs up a treat, but if you try and cut with it the engine dies off and the saw doesnt have the power to turn the disc through even soft rock, im using a 12" stone cutting disc and I'm baffled! You can feel the saw trying to pull the disc over lightly but it just wont drive, any suggestions would be a godsend!
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.
Posted on Nov 21, 2013
SOURCE: Ts420 stihl cut off saw
the jets in the carburetor need to be cleaned out very well to operate this engine
the holes in the jets are very small and clog up easily with in a year or two
Posted on Jun 22, 2011
SOURCE: 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.
Posted on Jul 18, 2011
if you havent tuned the carbi try screw the low speed screw gently all the way clock wise onto the seat then turn it back 1 full turn anti clockwise.if then it starts turn the la screw clockwise till the blade starts to run then back it off till the cut disc stops turning a simple tune done
Posted on Aug 09, 2012
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Clean the air filter and check that the choke is operating correctly.
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