Hi, Iam a Triumph Newbie who needs some help ferreting out a nasty noise. When I accelerate in gears 2,3,4 from a low RPM range, I hear a rattling that sounds as if it is coming from the left to bottom side of the engine. The rattling begins as I near 2600 to 3000 rpms and subsides soon after. I do not hear the sound when I run consecutively through the gears in quick succession. The condition only seems to show itself when I am accelerating coming out of an underpowered situation ie riding at a lower RPM at lower speed than than the gear might dictate, but not aggregiously low. I can recreate the sound in 2,3,4th gears by slowing to below 3000 RPMS and then rolling moderately hard on the throttle. Any ideas in simple terms (as this is the first bike I have had in years and my nearest service dealer is 3 hours away) would be greatly appreciated.