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3 comments
Defo a freehub problem, I've seen this a few times in BMX cassette hubs. My best guess is that the pawls and/or engagement ring may be worn or you may have lost one or more pawl springs. If you over-tightened the cones this might also be the cause of the problem as the freehub might be 'squeezed' preventing it from operating as it should (some hubs have a little washer-thingy designed to prevent this which can wear too).
The first thing that I would try is to loosen the cones to the point where you have a bit of play in the hub (ie more than you would actually want when riding) and see if this 'fixes' the problem. If so you might be able to find a happy medium that gives acceptable performance. If its more serious you might be able to replace some parts and overhaul the hub but it may be more economical to replace the hub outright.
Sounds like a problem with the freehub to me. What you can do about it will depend on your wheels. Some are serviceable, some are not. Probably best to go to a bike shop, unless you have a good selection of tools and are prepared to hunt around the internet for how to do it yourself.
As a short term solution it might be possible to put some penetrating oil in behind the cassette where the freehub meets the hub and let that work in (don't get it on the brake tracks!). You might be able to coax some life out of it by doing that but it's not a long term solution.
Take it to a qualified Bike Mechanic.