It starts and runs but as soon as you apply the revs it cuts out
Is it possible the linkage rod / bar from the throttle to the carb is not right ie cutting it out when should be reving it. just throwing an "out there" answer in
Try setting your carb, you will see three holes at the side of the machine nr to the fuel cap. the one at the bottom screw it in as far as it will go then unscrew it 4 turns, the one above it do the same again but unscrew it one and a half turns, if this dont work its possible draging air in from somwere ie, crank seals, inpluse pipe, gaskets. it will need to be presure tested.
I had this problem today 21-6 with this same TS410 and yes indeed my experience was there was a piston ring broken the upper and also there where crancshaft seals leaking and great slack on the bearings a 9 years old ts410, it has its working hours on it but there was also a groove in a flush port in the cylinder. the man Tony Tiler knows it also today i would search of anybody with the same problem i have found today. but the best thing is not to adjust on the carburetor before test on leaking seals close the air supply to the carburettor so it will must be sucket only fuel to the carter and look if it will come out the hole from the sparkplug after a while pulling the starter thats the best option and after pull out the fuel surplus by the muffler hold down to the ground, if that is not happens that you get a fuel surplus in a short time then you have the problem fast for shure allways asked " are there original fuel hoses used " ? porous rubber can also happens.
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