I couldnt tell you if that cheap kit was any good or not, I use the Zeda 80 motor kits myself as they are better made than most of the other Chinese kits available...DAMIENsorry my english isnt great... i was just wanting to say if that would be a good engine. its cheap excellent for me.
New Zeda 80 Complete 80cc 2 Stroke Motorized Bicycle Engine Kit - Firestorm Edition
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www.bicycle-engines.com