Hello everyone, my name is david and i am from england. I would like to purchase a bicycle engine kit and i weigh 13 stone. There are only two vendors here that i know of tigertooth and transformercycles. i am torn between the tigertooth 80cc with free replacement parts foe one year: TigerToothBikes.com or the 58cc generation2a all black version from transformercycles: Bicycle Engine Kit, Motorized Bicycle, Bicycle motors, Transformer Cycles, Grubee the tigertooth one is £189 and the transformer one is £222.87 both including delivery I want the black one because of the looks but i think the 80cc would be better suited to my needs because of my weight. Transformers highest engine size is only 69.7cc. Please could someone advise me i would be very grateful to you, david from england.