Recent content by jdhupp

On account of obvious wear on the piston skirt (worn semi-circular area on cylinder below intake port), I installed a new cylinder-and-piston assembly, but that did not solve the problem. Though the carburetor low-speed ports did not seem to be plugged (squirted carb cleaner through with no...

The skirt is the same thickness on both sides, at least to within 0.004". Since the intake side typically gets more wear (airborne abrasives), how far would you typically let the cylinder wear out before replacing cylinder and piston? Apart from that, with compression at 120psi, is the...

Compression (just checked) is 120 psi. I think nominal might be 137-139. One guy was telling me I needed about 130 for decent idle. What do you think? I attach photos which I hope someone can judge. There is a light half-circle under the intake port, and on the top of the cylinder on the...

Suppose I should check that to cover the bases, but I would have thought that unless it was really low, it would idle -- at least with idle set high -- but bog down under load.

Hi, all. I've been troubleshooting an idle problem with a Stihl saw (TS-400 cutoff saw) and I'm nearly out of ideas. Hoping someone here can help. I feel invested now and don't want to simply hand it over to the service department. By the way, I bought this saw used, so I don't know anything...