I bought two satio 72's last fall and both had a bad midrange rich problem. In fact, I was so disgusted I was ready to toss them both in the dumpster. Luckily someone here on rcu rescued me and both now run great. I think if you lean out the low end you'll be fine. The low end needle has an effect on the mid range. I also thought more break-in time would help but that wasn't the case. Here a link to the website I was directed to. Go to the throttle setup page. Good luck.....Dave

http://home.gci.net/~bjw/Saito-Engines/index.htm