Hi X-Kid from a fellow Brit. There are a lot of threads on the forum detailing the manufacturing issues that have been discovered over the years. These problems - détente spring, gearbox issues, etc have been few and far between so it's not a 'common issue' as such. As chandelierman said, 2010 roadster onwards is where the teething problems have been ironed out. Keep us up to date with your search results (don't forget the pictures)and any questions on the various bikes, ask away on here. There is a vast databank of knowledge on here just waiting to tapped into!!