I acquired 2 200t's within the last month, and before I used either of them, decided to tear them down and check the cylinders. Here's what I found:
Saw #1:
I noticed play in the bearings before I tore it down.
Compression check yielded ~140 PSI.
Saw hesitated when given gas.
Saw #2:
Bearings TIGHT!
Compression check yielded 150 PSI.
Fuel line is cracked (can't tell if it's all the way through, but...)
Runs okay, didn't really try it out.
After the tear down, saw #1 has NO scoring on the piston or cylinder. There's a little carbon on the bottom of the piston (just the bottom edge).
Saw #2 had (I already cleaned it up) a little scoring on the cylinder, and the piston is scored across the entire exhaust side. The rings are still free, not stuck in the slots.
Here's what I'm thinking about doing. I got both of these for a decent price, so I'm thinking about putting the good piston in the saw with good bearings. Here's where I'm a little confused though... Why would the saw with the scored piston have higher compression than the saw with a cosmetically good p&c? I'm thinking about replacing the rings when I put it back together just for good measure. Could the rings be worn to the point where they don't produce as much compression?
One more question... The fuel tanks are a little bit different between the two.. Saw #1's fuel line and vent go through the tank at the same point, and look to share a grommet. Saw #2's fuel line goes through the center of the tank, and the vent is on the edge (near the fill cap). Which style is newer, and/or which style should I use on the saw that I'm going to keep? Cosmetically, they're about the same.
Thanks for the info!
Saw #1:
I noticed play in the bearings before I tore it down.
Compression check yielded ~140 PSI.
Saw hesitated when given gas.
Saw #2:
Bearings TIGHT!
Compression check yielded 150 PSI.
Fuel line is cracked (can't tell if it's all the way through, but...)
Runs okay, didn't really try it out.
After the tear down, saw #1 has NO scoring on the piston or cylinder. There's a little carbon on the bottom of the piston (just the bottom edge).
Saw #2 had (I already cleaned it up) a little scoring on the cylinder, and the piston is scored across the entire exhaust side. The rings are still free, not stuck in the slots.
Here's what I'm thinking about doing. I got both of these for a decent price, so I'm thinking about putting the good piston in the saw with good bearings. Here's where I'm a little confused though... Why would the saw with the scored piston have higher compression than the saw with a cosmetically good p&c? I'm thinking about replacing the rings when I put it back together just for good measure. Could the rings be worn to the point where they don't produce as much compression?
One more question... The fuel tanks are a little bit different between the two.. Saw #1's fuel line and vent go through the tank at the same point, and look to share a grommet. Saw #2's fuel line goes through the center of the tank, and the vent is on the edge (near the fill cap). Which style is newer, and/or which style should I use on the saw that I'm going to keep? Cosmetically, they're about the same.
Thanks for the info!