Ninja 400 slightly more difficult engine-swap since rear-suspension is attached to engine instead of frame. Simple enough to hang rear subframe from garage rafters to make it easy to remove suspension, then engine.
Budget at least entire weekend for swap if this is your 1st time. Take tonnes of photos & videos of each disassembly step so you can put it all together in reverse order. Be careful with all EFI injector & sensor connectors. Squeeze release clip on connector and verify it's no longer latched before pulling on connector, not wiring. Seen many cases where wires were yanked and this causes problem you won't notice until after you've got everything back together.
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