4th gear issues R3R 2011

Fantastic video. It actually looks pretty much undamaged. Looks like you may have to strip out the selector drum and forks to rule them out.
 
Real clunky and not positive at all gear changes. Is it cos the engine is the wrong way up? The selector forks don't slide in the selector drum very well. In fact one looks quite worn.
Is it just the camera angle or my eyesite but does that hole at the bottom of the shifter fork look oval?? If so, would that cause the fork to wobble on the shaft which would prevent complete engagement of the gears/dogs and the wear seen on the fork portion. What does that shaft for the selector forks look like? Can you wobble the forks on it? (PS, I've never heard of anyone having a problem in this area before???)
 
The detent wheel itself has a worn notch in it which I could feel when checking for sharp or damaged surface
 

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