:scared:i recently Replace o rings under balance bar and re connected all the hoses and when i started the engine all was good until a small amount of smoke came trickling up the back centre of engine with a hint of a oily smell just wondered if any one would know what this was and could point me in the right direction as to fix it.

Could it be a crank case breather pipe come loose?

start it up again and see if it still does it, might find it could of been oil that dripped out from the balance bar and landed on something that gets hot and it was just burning off before you start pulling everything apart.

as voddy says!

Cheers guys will give it a go later today and see what happens