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07 Gilera 50 Runner loses power when warm?

It's ok when I start but after about 5mins the revs drop to 7000 and the speed goes down to about 28mph. It was prof derestricted 4 months ago. Replaced the spark plug and fuel pump/tap. Any ideas of what else to try?

Brad
October 2010
GileraVehicles, MotorcyclesPower Start Revs

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