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Hi, can the crankshaft and secondary shaft bearings be changed on a kz750N1 Spectre without taking the engine out? Thanks

No. You need to split the cases to replace any of those.
The crank bearings are also shell type and the same for the big ends..
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The secondary shaft can be removed but as mentioned, the cases need to be split to get to the crank bearings.

Why do you want to replace them? Those bearings rarely go bad unless the bike has a lot of miles or was abused.

Hi, the secondary shaft bearing is grumbling and so needs changing so thankfully I can do this without removing the engine, I was just going to renew the crankshaft bearing whilst doing the other but will now leave it alone. Thanks