Agree, a bypass on the cylinder head side of the thermostat to the waterpump intake would work. The size of the bypass ID hose/fittings would be important, did not keep any info on this unless it's in this thread.
The OEM thermostat information used in the original post, cracks @ 146F to 152F, found this info to change in a later service manual "supplement" to crack @ 177F to 182F with full open @ 203F.
I ride this Ninja weekly and it still warms up nicely within 5 to 10 minutes when the temps are 40F and have not had any issues with it when the temps are 90F and above.
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