ORIGINAL: DarZeelon
Since at full throttle, with a properly adjusted high speed needle, the con-rod is always in compression, it cannot make any noise; even if it is loose on the crank-pin, or on the wrist-pin.
the "always in compression" theory only applies to slow running 2-strokes and not our glow engines. the constant ball and socket resetting needed in a hard running cox engine is proof that the rod is also in tension during part of the stroke.
dave