I'm thinking of using The Skyhawk Stage III Whopper Stopper kit from bicycle-engines and the $74 Wal-Mart Men's bike (I can't post links). Does anyone have experience with that kit? I'm new to motorized bicycling and hope for something simple and reliable. I also want to add a back rack, cupholder, paint, etc to turn it into a perfect commuter. I weigh 120 Lbs and don't have any killer hills, so can I add a 36 or 44 tooth sprocket? Any help would be greatly appreciated. Thanks!