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My big end has expired after only 8000 miles. On removal of the two plugs from the crank web I found this wedged in the middle. Ok, this explains my cranks early demise, but what is this part and where did it come from? It appears to be spring metal.

The only thing I can think of that looks remotely like that is part of the gear selector fork. Regards Steve

On thinking about it more, I came to the conclusion it's far too large to have found its way there from somewhere else, so must originate from there.
If this was placed directly in the middle, it would direct the oil flow around it - towards each plug. Without this, the oil would simply flow straight past. So I guess its important to have it in place. As mine is broken, any ideas where I get a new one from ?

Some cranks had a restrictor in the feed end to boost the feed to the top end. It was a roll pin [spring steel] that fit a few millimeters in from the end. Leave it out and read the article Kevin Bracken wrote about building his race engine[s] and improving the oiling system.