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There are two problems related to the crank hub: first there have been cases of the crank bolt to back out due to vibrations which can be resolved with a crank bolt capture, and the 2nd problem is the fact that it is not a one piece hub and that in some occassion the sprockets spin which can be resolved with for example the Gintani kit.
The solution to the aforementioned is a combination of both solutions. If you are paying someone to have it done you are looking at a major cost of approximately $5000 due to extensive labour costs, could take a tech 30 to 40 hours for the work.
The F8x produced after December 2015 have a new bedplate design and friction plated but that did not resolve the problem.
The number of cases are still very rare...
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