I wouldnt trust a morini in a walmart bike. Just my opinion here. I own a huffy cranbrook, and I wouldnt put anything with more than 2 or 3 horses in it. cheap bike, cheap engine. expensive engine, better quality bike. I got lucky having had an ht engine in my Cranny for 2 years with no issues, but Walmart bikes are not widely known to hold up well to being motorized. If you are going to spend the money on a morini, may as well spend the money on a stronger frame. with a morini, you will basically be driving a home-built motorcycle. Do you really want to trust a $100 dollar walmart frame to that kind of power?