"I ordered the Thunder Shark Pro Racing 66cc/80cc Bicycle Engine Kit, with 40 Tooth CNC Sprocket for $389. GasBike.net promptly e-mails an order confirmation number, and several days later I receive a Fed Ex tracking number, scheduled for delivery by the 9th of May. Six days transpire and my parcel never arrives. (FED EX Never received it for shipment, WTF!) Gasbike.net doesn't answer their phone or e-mails, so I promptly file a dispute claim with my bank. On 5/11/2018 Fed Ex does confirm my parcels were received and they're on the way, so I withdraw my dispute claim with this business. Pending the quality of this motorization kit, I may bump GasBike.net ratings up a notch.

Upon initial inspection I found one broken piston ring, I can go no further with assembly. I email GasBike and Steve says he will send me a new set. A week transpires, I get my piston ring set and begin assembly. I soon learn the piston skirt is 3mm too long and bottoms out on the crankshaft and won't turn 360. I also find a dinge across the mating surface on the cylinder head. For what I paid for this high end engine kit, I shouldn't be dealing with such defects. I contact GasBike and ask for a new engine kit, but was refused because I had this kit longer then their one week grace period. If anyone wishes to purchase bike motorization kits, I highly recommend avoiding GasBike and make your purchase from more honest venders on Amazon, Ebay or Bikeberry. Seeing how GasBike ships out defective kits and blows off their customers, I won't be doing any business with these gasbags ever again. "