You have a couple of options;

1) replace the cover -> http://www.cmsnl.com/search/partnumb...spbpmodelcode=


Or,

2) re-tap the hole -> http://www.machinemart.co.uk/shop/se...ategory/page/1

I can't remember the size, but if you are buying a repair kit, it's probably going to cost you more than a new cover !


<edit>

Or - you could get a 2nd hand cover, it's the same part for the XT600 & Xt660 motors

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