It's been several years since I last ported one of these. At the time I did not have a lathe or a right angle grinder. This one got a .020" popup and more transfer work than I could do at that time. I am very pleased with how this saw turned out. It has fantastic torque, RPMs, throttle response, idle, and starting. This is all the saw most any firewood hack would ever need. I do love me some 50cc saws!
Point of interest: Be VERY careful how much you lower the cylinder. I dropped this one about .026". It's covered, but is right at the point of free porting at the bottom of the exhaust port skirt when at TDC. A little free porting doesn't kill a saw, but it's certainly something you try to avoid. BTW, compression was 195 after the initial warm up and cool down to burn off the assembly lube.
The muffler is a bit of a pain to mod on this saw. I drilled the spot welds out of the deflector and removed it. I opened up the hole underneath significantly. While the deflector was off, I removed the baffle at the end of the internal cage. I then welded the deflector back on and cut a new wide mesh screen for it.
Point of interest: Be VERY careful how much you lower the cylinder. I dropped this one about .026". It's covered, but is right at the point of free porting at the bottom of the exhaust port skirt when at TDC. A little free porting doesn't kill a saw, but it's certainly something you try to avoid. BTW, compression was 195 after the initial warm up and cool down to burn off the assembly lube.
The muffler is a bit of a pain to mod on this saw. I drilled the spot welds out of the deflector and removed it. I opened up the hole underneath significantly. While the deflector was off, I removed the baffle at the end of the internal cage. I then welded the deflector back on and cut a new wide mesh screen for it.
