I just purchased an 08 GL 1800 with a 2015 Motor Trike conversion. It has 74000 miles and has been meticulously maintained by the former owner. It runs like a top but there is a vibration/rattle noise when accelerating. It sounds like it is coming from the front of the bike but I'm not 100% sure. It happens in all gears when accelerating but stops once it is at a stable speed. I'm not sure if it is something in the gearing (it doesn't do it when I rev the engine in neutral) or something in the fairing that's loose. Any ideas or suggestions would be greatly appreciated. Thanks.