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@slopster
I noticed today while lubing my chain that as I the crank turns the chain gets tighter and slacker. It does this at the same point of the pedal rotation each time which indicates that the chainring is the cause (ie. its not in time with the rear wheel rotation which would suggest sprocket problem or at random intervals which would suggest tight point in the chain). No matter how carefully I look at the chainring as it rotates I can't see it bobbing up and down so it is obviously a very small off roundness maybe .5mm but does make the chain go noticably slack then tight. The chainring seems to be centered on the crank arm ok and the crank isn't crooked on the BB. I should add that these are cheap no name cranks I got off ebay.
Being new to fixed gear is this something I need to sort out or is it just something I have to live with using cheap components with poor tolerances.