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What Can I do ?

I have a mountfield RV40 150cc, its starts ok but after running for a short while it starts to speed up and slow down (Ghosting). It has new oild and petrol but no effect. any thoughts. if any one has a answer would be greatful for the advise.

Thank You Martin
Martin, June 2010
Engine hunting is normally because it is running too lean, clean carb, jets and filters

Husqvarna man, June 2010
link Click here to see other fixes for Mountfield RV40.