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Tony, Obviously, doing your own tests with the bike or exemplar bike would be best. But that's usually not practical. In "Traffic Crash Reconstruction" 2nd Edition by Lynn Fricke (section on motorcycles), if you know horizontal and vertical COM you can calculate the factor (see formula on ...

Can you post a sanitized version of the report? That would help identify the problem. If the event record is complete, you don't have a power failure situation. The battery being disconnected following a crash won't do it either.

Nissan CDR reports will often report the Delta V in the wrong direction. Nissan is aware of this issue.

That model year Nissan cannot be imaged by the CDR Toolkit. It's too old.

In a crash, the collision force is equal and opposite (equal in force and in opposite directions). No one can tell by photographs which vehicle was moving and which was stationary. In a collision, the weaker structure suffers the most damage.