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@robertAJB
In case anyone runs a search for such an ailment, thought i'd post this. Might help out another fellow newb. I learned some new shit, wanted to pass it on. If you have any clue at all about building bikes you'll prob be laughing by the time you reach line.2 .. this is purely for the simpletons like myself.
So my crank was making a weird knocking, clicking sound. Seemed to be particularly bad when just setting off. This had been going on for a good week or so, steadily getting worse. It felt nasty, made the bike feel real loose and rank. No good at all.
While riding and contemplating this weird disease my poor drivetrain had picked up I eventually decided it had to be the Bottom Bracket. Such is the beauty of single speed right ? There is so little that can go wrong. My chainline was straight, my cogs were all true, chain well lubed.. all that shit. So i tried getting the crank arms off.. no joy, those badboys were on hard-as-nails. Turns out i needed a 'crank puller'. Eventually bought one today on the way home from work. I'd already picked up a 'BB Tool' when installed the crank in the first place.
As soon as I'd got the crank arms off and took the BB tool to the lock-cup thing of the BB, it was emediately apparent it was well slack. I took it all out, gave it a clean, greased it up good n proper and then re-installed it.. turned it in super tight. Next just re-installed the crank arms and took it for a spin. wow.. a whole world of difference.
Thinking about it now I feel like a right tit. Such a simple thing. Anyway.. in case anyone else suffers a weird clicky, knocking crank. Try this. Might be your prob.