I had the same thing as mini-s-man, ie. lots of smoke every few starts and a bit of a rattley noise which goes in a few mins(on my tt600r).
Had someone more mechanically minded than me look at if after 50,000kms. He gave it a piston and rings, new camchain and tensioner and a new set of valve stem seals. Apparently the seals were v-shagged and caused most of the oil smoke and a bit of a rattle.
Did you change them?
The big nut at the end of the balance shaft is the problem one, not the crank, i think(stuck the bugger on with bearing loctite whatever). Apparently it makes a very scary noise which you will not mistake with a bit of a rattle.....
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