In 90% of the cases, coolant leaks are the culprits that cause overheating.  Please check out our coolant leak page here:
FC3S Pro - Problems #1, Engine, Coolant Leaks

If possible, get an aftermarket water temp gauge to confirm the engine is overheating.  Relying on the stock water temp gauge is not a real good indicator of accurate water temperatures.

Since the cooling system is not very complex, we can tackle other possibilities one component at a time.

Questions?  Comments?  Send mail to: