First thing I would do is check the battery is fully charged. Make sure any connections (coils/plug caps etc.) that may have been distrubed are firmly connected and their fittings are clean.
Another one, that may sound silly, but I've done it myself; check the choke cable has been refitted! They can be a bugger to start without choke!!
If all this fails, and you are sure you have a spark and fuel, then there's no reason really why it shouldn't start! Find a slight hill, knock it into second gear, and bump start it!
(Done that before too! 
)
You could always have the coils tested too, but I reckon it's most likely to be a slightly discharged battery, and NSR's simply love a good battery!
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Andy.
NSR-WORLD.COM
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