Fontyyy, you say all four of your cranks had the right hand primary main bearing gone. As I recall in the Donington pit lane you could feel the crank was shot just by feeling how much play there was in the crank by pulling on the flywheel. All those main bearings are shot not just the right hand one. When a cranks time is up its up I guess.
Moving on though and the reason for the post. While surfing pictures I noticed this. While the NXA still has a hole with a very limited pool, the 500V just has a hole. If there is a need for a pool which I doubt, it can only be for a road bike when it is assumed it will be sat for periods of time.
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If I have to take the carbs off once more...