Hi, first post. I've been trying to learn how to port a saw and I've had some good luck with a couple of small saws I've done but I haven't had the best of luck with the 372/2171 saws. The two I've done ran good and strong but just didn't have the high rpm I was looking for. Right now I'm working on a 2165. First I tried to port a used 372 cylinder with a 266 pop up piston. It ran good but just didn't have the rpm. So I tried cutting on it a little more and ended up ruining it. Next I tried porting a 52mm BB, it's on the saw now, Someone on another site gave me some numbers to try and I used those. The saw runs pretty good but it just doesn't have the higher rpm I want. The port timing as it stands now is, exhaust 101, intake 80, transfers 121. the exhaust an intake was widened and the lowers was gasket matched. The compression is at 205psi cold, I cut the base, and it's running strongest at 13,200 wot. It pulls a 24" bar in oak fine but this is just a saw to play around with so I'd like to move the rpm up and keep the torque. If any experienced porters could give me some pointers I would really appreciate it. The video below is how its running now.