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Do you have a multimeter? Measure between the frame and the end of the screw thread under the rubber boot on the starter. You should see +12V while the starter is running.
If you see 12V on the thread, then the battery, wiring and contactor are all OK.
If you don't, then either the battery is weak or you're getting a voltage drop somewhere between the battery and starter. It's worth probing directly on the battery itself, on both terminals of the contactor, and on the crimp terminal under the rubber boot on the starter.
It's a very simple circuit and there aren't many places where a voltage can be dropped.
If the contactor has gone, there are cheap alternatives available on Ebay that do fit. IIRC I put in an aftermarket one designed for a Kawasaki and it was fine (but had the input and output terminals the opposite way round - watch out for this if you go this route!).
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