I

[grog]

Yoda, you probably have but just double check your chain. a while back i thought my gearbox was stuffed. was the chain, couldnt believe it. went from perfect to clunky in a matter of no time. new chain, just sweet. when old chain inspected, two tight spots, couldmt even find them with chain still on bike. i blame chain lube, they were dry. now use gear oil, as manual says . sometimes the simplest things. i was like you, ready to strip bike down. since using gear oil, chain has never sounded as nice before. vmx castrol, it doesnt stink.   

[Yoda]

Thanks grog. Working my way through it chain looks good but I am going to refit my exhaust there isn't a lot of room between the chain and link pipe. I contacted Seth he suggested that the clicking noise was overtightening  of the rear caliper brace. Spot on I eased it off and the crack noise has stopped.
Paranoia now subsiding
Cheers Yoda

[seth]

glad it was a simple fix buddy
if all was working fine before then can only ever be a check and re-adjusting of things to sort out.
as ever always happy to help .😎