My Yamaha Won't Get Wide Open!

The ONE Thing That Was Secretly Overheating My Yamaha Outboard

A persistent overheat alarm is crippling this Yamaha outboard, locking it out of wide-open throttle. What follows is a comprehensive, frustrating mechanical and electrical investigation, ruling out common culprits like faulty sensors, damaged impellers, and sticky thermostats. The true, baffling problem is found not inside the engine, but in its basic setup. Watch this deep dive to see how a seemingly perfect mounting position was secretly starving the engine of cooling water at speed—a subtle issue that required a major, structural fix to unlock full performance and achieve the true WOT speed.