Not again!! Cam Chain Tensioner Spring

[Simon.Pieman]

My plunger will not push back in,even without the spring fitted. Seems a good design to me?
Anyway good debate at the very least!
In hindsight I would not have now gone manual but hey,it looks cool!

Have you got pictures? This might be a tensioner from another model/engine, or perhaps Yamaha modified the design of the original.