Ordered the bbr f -zero kit with engine. Unpacked it, nuts screws & washers littered in the bottom, no clue what other small parts fell through the box hole. Seat had small tear. Rear brake caliper was connected to the bike & was busted. Seriously no parts list, no manual you have to watch incomplete videos from a bikeberry guy who probably gets better patrs & pieces. Rear wheel must be missing a spacer or it wouldn't get sucked and jammed into the disk brake. Motor does not fit correctly unless maybe you buy the special bracket. "Racing" Air filter touches Frame and way to close to the tank petcock. Gas cap no doubt would have future issues fits like garbage. Everytime you touch the bike paint comes right off 😆. Aluminum frame pretty useless. Emailed twice, no response. Don't, waste hard earned money on that thing, basically like throwing money in the trash. Had better luck with cheap Huffy frames.