RE: Macchi 202
Remember this is a Rossi, from the factory it was set up with high compression. I had to put a head shim in to keep it from popping plugs with 15%. Exh timing has been the only other change it's at 170 now. I can't go much further because we must demonstrate a 4,000 rpm idle for 10 seconds. Needle is about 1/4 turn rich to lean.