That's a handy chart that I have looked at numerous times in the past. If I remember right, my Poulan 42cc had exhaust timing that was a touch low. I raised it to 150 degrees. The engine ran strong with a 15mm carb and a free breathing exhaust, along with the exhaust port timing change. If I remember right, it turned an 18 x 8 at 8500 rpms. A 20 x 8 or 10 would probably be a better prop for it.

Just out of curiousity, does anyone have any stock timing numbers for the Zenoah G-26, and/or any of the DLE engines???

AV8TOR