When i start my stihl concrete saw it will run but when i take the choke off it just cuts out i have cleaned both filters and checked the spark plug could anyone help with this problem please.
This is a fuel starvation issue, first thing to do is replace the fuel filter in the fuel tank, hook the hose out through the filler hole with a length of bent wire, once out pull the filter off and replace.
Testimonial: "thanks andrew will try this and the fuel filter is the only one not checked. "
SOURCE: i have a stihl saw ts400 change plug ands air filters but wont start please can you help
Check the compression, these machines work in very harsh conditions, as a compression test you should be getting a good 120 psi.
SOURCE: changing spark plug on a Stihl 410 cut off saw,
right by the decompression valve is the spark plug. if you remove the one screw for the valve you will see that to get access to the plug is very easy,
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
This sounds like the carb is flooding, there is a rubber tipped needle under the metering side of the carb, this may be leaking, before replacing the needle make sure the air filter is not blocked, replace with a new filter and try again
SOURCE: stihl ts 400 wont start
If there is good fuel in the tank and the plug gets wet with fuel, and there is a good spark stating the obvious it should go, if not there could be a mechanical issue, piston scored, rings worn etc,
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