I have been researching these bicycle motor kits for a while now but have no clue which one to choose I want the fastest most reliable kit I can get. Suggestions please!
It all depends on your budget. If you want a stock motor, I would recommend the stock F80 kit from thats dax. If you have the need for speed and are willing to spend more, I would buy an F80 bottom end from DAX and get a top end kit from fred or somewhere else.
I agree with Fischer550 on this as well, the Dax engines are some of the best out there, Neil (Motorbicycleracing) also sells a very good engine with noticeably better quality than your typical kit. You can't go wrong buying from either of these sources.