Stihl TS350 Cut Off Saw

The Stihl TS350 is THE original cut off saw (in my opinion!). Be aware that the specifications vary slightly depending on the age of the machine and is different to that of the later TS350S. In particular the cylinder bore is slightly smaller and a different spark plug is recommended.

The picture here is a stock photo of this model of saw, I do own one but it’s in a hundred pieces at the moment in the process of a most uneconomical rebuild. My Stihl TS350 is beyond my maintenance tips for now!

I bought the saw for next to nothing on Ebay and was assured that it would run, don’t they all say that? (heavy sarcasm there…) Of course it certainly didn’t run and it was quite clear why with a minimum of examination.

Firstly where the carburetor usually is there appeared to be a mound of semi-solidified brick dust, upon cleaning the filth away I discovered that there actually was a Tillotson HL carb under there, albeit a bit stiff and in need of a thorough clean inside and out.

My original compression test showed a slight lack of compression but nothing to worry about (or so I thought) and my handy spark plug tester showed that we had a spark. The engine also turned over cleanly enough so I made a few attempts at starting it… nothing… not even a cough!

I was wondering how well the carb was functioning and decided to dribble a little bit of fuel into the top of the cylinder to see whether we could get even the smallest bit of ignition… still nothing.

At this point I decided to try my compression test again, my theory being that the fuel I dribbled into the cylinder had cleaned the piston and bore a little and may have loosened things up a bit, sure enough the new compression test showed a drastic loss of compression!

Now it was time to check out the inside of the cylinder, I stripped the carb and exhaust off and removed the cylinder block. The inside of the cylinder showed some interesting signs of wear… upon checking the piston I discovered that the skirt was severely burned away on one side.

So now I knew what I had! A saw that had almost certainly been run without oil and had overheated to the point of terminal damage. Question is now whether the crank and bearings are shot too and whether the whole thing would be better in the scrap bin (it almost certainly would be best there but I’m a sentimental old sod and can’t bear to throw away an engine that I might just breathe a little life into!)

Standby for more of this tale and photos!

General Technical Specifications:
Model Name TS350 early models ( later models and TS350S )
Engine Type Two-stroke, air-cooled, single cylinder
Engine Capacity 56cc 3.39cu in ( 60cc 3.68cu in )
Cylinder Bore 47mm 1.87in ( 49mm 1.92in )
Piston Stroke 32mm 1.26in ( 32mm 1.26in )
Spark Plug Type Bosch W175 ( Bosch WSR6F )
Spark Plug Gap 0.50mm 0.020in
Carburetor Type Tillotson HL diaphragm type
Fuel Mixture 50:1 using high quality two-stroke oil for air-cooled engines