Chainsaw Repair

Saw Troll,
I can't find a model number, but the make is Tilloston. I do see a SN and it is:  S224AC45E. It also has the number 10 stamped on the top left corner of carb when viewed facing the HL screws. The SN is on the opposite side of the carb on the top left when facing that side. I did replace the pump and diaphragm since I had the saw down. I used the parts from a 163A kit. I did not change the needle. It looked to be in good shape. If you have any other thoughts, please share them.

Since the consensus seems to point toward my saw being a 266 model, I searched the archives here and found that my saw is very likely to be 266-1993-01, which seems to support the 266 case, and to clear up the carburetor ID issue for me. It's a 224A model Tillotson. I tried to paste the document here, but I received a message that the file is too big. I don't understand why since the post that I grabbed it from had several other files included in addition to the one I saved.

Yes, those numbers off the carb tells it is a HS-224A, which has a 17.5mm venturi, vs. the 15.9 of the HS-163. The RK kit is the same for both carbs..

The 266 used the HS-163 (or a similar size Walbro) up to some time in 1985, and the HS-224 after that.

A picture of the number tag of that saw would be interesting.....