They make a 3rd gen Thermo-bob for the Ninja 250 that might work for the RX3. It looks like it connects inline instead of bolting on, but I could be misunderstanding the diagrams.
http://shop.watt-man.com/Thermo-Bob-...-YEARS-TBN.htm
Spud, I think that's how it works. When the engine is cold, the bypass allows warm coolant to warm the engine faster. The second thermostat in the Thermo-bob closes the bypass at 195 degrees, so the radiators can do their job. This keeps the engine at a steady 185-195 degrees F, so water and fuel can vaporize and exit the crankcase.
