Mine's a CH. I also downloaded their timing instructions. It look like I'll need to run the engine before I can determine if I need to adjust it. Since I bought it used, and haven't changed the timing myself, I'm hoping I don't have to. Thanks to all for the great advice. I'm sure I'll be calling on everyone once I get fuel in this thing and try to start it. From all the threads I've read on here, it seems like a miracle anyone can get a 2 stroke gasser to run properly, yet, I abuse the heck out of my weedwacker and it runs flawlessly. Now if I could just decide on a fuel can.