I recently purchased an Avistar ARF. The instructions do not mention putting downthrust in the engine but I seem to remember reading somewhere that its recommended. What do you think? How much downthrust, if any? Thanks, all!!

I wouldn't put any downthrust in it if the instructions don't call for it. Just put that engine on an dlet 'er rip![:@]

THe down-thrust is already built into the firewall, as is the right thrust. Just mount the engine & go flying.