Further research has led me to believe the Euro 5 engine is beyond tuning possibly because of the electronic carb? Would it be possible to change the carb to a non electronic carb from an agility 50? I assume the ECU / Fuel mapping software would have to be bypassed? Ultimately, if my plan to fit a larger (80 - 90cc) cylinder kit cannot be performed on the Euro 5 engine, I will be forced to rip out the existing engine and fit an older tunable Kymco 50cc engine.