Hi guys, ive recently purchased this bike, anyway it has a engine rattle that is constant and rpm dependant but oddly and confusingly it entirely goes away when the bike is leant over a little bit to the left. If you stand it upright or lean it to the right it just remains the same..?? The bike runs like it should apart from the noise (which sounds like a bad top end rattle). Please can anyone shed any light on this??