I've got one of these little Ryobis here that several of you have mentioned for about $100. Immediately upon removing it from the box, it was obvious it was a Redmax. It looks nearly identical to my 3800, LINK. I believe this is a copy the Redmax GZ400, LINK. The only apparent difference between it and the 3800 is that it's stratofied.
Bone stock, it runs better than the 3800. The 3800 has to be muffler modded or is the most gutless saw I've ever run. Once opened up, they are very respectable and have been my favorite little saw.
Externally, these saws are very "plasticy". The fuel and oil caps are small and easy to miss or overfill. Underneath the covers though is a different story. These little saws are way better built than most of their competition. They have a vertically split magnesium case and a bolted on cylinder. The rod is beam shaped and has a caged needle bearing. The two bar studs are mounted in the metal crankcase, not in the plastic around it.
I've got this one torn down to see if I can get a little more grunt out of it. The ports are tiny and won't be easy to work in, but we'll see what happens.
I just thought you guys might like seeing what can be had for about $100, and is better built than most of the competition.
Fresh air is taken directly into the extra transfers above the intake port.
Back side of the intake block.
These are the two extra transfers fed by the extra air intake ducts.