So, Temp code, 1-5 warning light with restricted rpms to protect the engine occurred. Purchased a Exhaust Temp Sensor for the 2002 Suzuki DF140 and installed and no more warning! I ran the motor without sensor (basically a bolt that sits inside the exhaust manifold exposed to the heat and water) and saw a steady stream of water out the bolt hole so no real overheating problem, just an old corroded bolt with 2 wires on it. The new sensor/bolt has a coating to keep it from corroding as the newer models of Zukes either do not have an exhaust temp sensor (just uses a cylinder sensor) or the bolt stops in the metal and doesn't continue into the water.