Hey guys, how about that drumming noise at higher throttle settings? (See Post 603.) I've seen and heard four different UCD 46s with OS 70 Surpass I and II engines make the noise. I guess everyone is just living with it? Being a quality control freak, I've tried to eliminate the cause. (installed wing saddle tape - it helped. ) I tried installing a 1/8 inch rubber home-made gasket behind the engine mount....and rubber washers.... and it still maked the noise. I'm considering getting some sort of soft engine mount, but I don't want the hastle of having to redo the blind nuts and engine cowl cut outs for needle valve etc. What do you guys think? It's gotta be happening to you.