I would use superglue, too. And in addition to that I would try to friction weld it with some filament and a dremel. That is working really nice. It helps when the seem has a (small) v-shape.
http://diy3dprinting.blogspot.de/2014/01/how-to-friction-weld-plastic-with.html
http://hackaday.com/2012/12/31/make-your-own-plastic-friction-welder/
EDIT: Try it on some old printed parts first, to get a feeling for the procedure.
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jcosmo 5
PLA welding - I just use superglue.
Do you have to use PLA? It goes soft at anything above 50 degrees, and if you intend to use your motorbike outside you're likely to find the pieces just deform even with it just standing still.
ABS is better suited to outside pieces, and welding it is relatively easy using acetone.
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