Without a radiator bypass, oil temperature is at 177(+/-4)°F, and up to 205°F in slower traffic at 80+°F. It can barely ever reach at least 212F as it should, as witnessed by poochar's oil temp gauge with temp sensor in oil pressure access plug.
Engine operating temperature is not as stable and uniform because of the coolant's poor temperature management, and warm ups are not as quick or normally sufficient. It's often not up to ideal operating temperature which does affect long-term wear.
By way of answering in a round-about way - V8 engined 'ski-boats' do not use radiators (in most cases), so cold water is ALWAYS entering the engine's cooling jacket, resulting in the cylinder where it enters wearing out way quicker than the others, as it NEVER gets to proper operating temps (meaning the engine clearances will be TOO big). Bill, "Thermo-Bobs" inventor, is an engineer, and decided to put thermo-couples ALL OVER his KLR650's system, then, as he rides the same route to work each day (in Phoenix, AZ, which gets DAMNED HOT in the summer, and chilly in winters) to see what was happening. He discovered pretty quickly that, as indicated by swings on its temp gauge, it never really got to a stable temp EXCEPT when being operated in very warm temps. It's all detailed on his site:
so just look around till you find his data.
In chats we had after I got my '08 Versys, he decided to buy a Versys and attach thermo-couples to see if the V system ALSO did not have a bypass. His research showed that, so he 'worked-up' a Thermo-Bob for the Versys community.
I attached one of his first Thermo-Bobs to my KLR and noticed the change right away, so when he made the Versys kit, I bought TWO - one each for my '08 and '09 Vs.
I BELIEVE that they are excellent products that fill a need to fix "Ma Kawasaki's" decision to 'cheap-out' on engine cooling....