i have a few older DLE 20cc engine and just bought another one a few months ago. i know DLE has resigned the exhaust muffler. i'm running a 16X8 master air screw prop. at full throttle i would top out at around 8300-8350rpm's. now i'm around 7600-7700rpms. i've noticed between a 300-500 rpm decrease at full throttle. why? otherwise, all engines run well. thanks for the help.
Last edited by jet jocky97; 06-28-2019 at 07:10 AM.