Great PLanes isnt going to give you a new one, because: You voided the warranty in the engine department, its only supposed to take up to a 91 Four stroke or 2 stroke, and you voided the warranty in the covering department, that counts as modification. IM not dissing you, but this is happened before, my friend had a 120 four stroke on his, and they voided it. Just get the 50cc Yak, as it will fly better than the 68" Yak