Hello everyone. I have a DA-50 on an Aeroworks Extra 300. When I'm flying at about mid-throttle, I hear what sounds like 'knocking' or pre-ignition from the engine (it actually sounds like a clicking). It's not the airframe or anything loose as I've previously had this engine on a different plane (Aeroworks Yak) with a different exhaust system and could hear the exact same thing. Others at the field notice it too and are always asking me what it is. I run regular unleaded pump gas with Belray H1R synthetic 32:1. I'm about 2-3 gallons into using synthetic oil but even during break-in when I was still on Lawnboy ashless, I could hear the same thing.

Any suggestions ? Timing perhaps ? Can the timing be checked or set ? Anything else ?

Any feedback would be very much appreciated !

Thank you !