This started as a 2 stroke stock scooterx dirt dog. I removed the stand up handlebars, added the seat, and most importantly, I added the 4 stroke motor. No more mixing oil and gas! I weigh about 160, and i get up to about 24 mph on flat ground. Because its 4 stroke, the torque off the line is not great, but it was a good trade for me because i don't like how loud 2 strokes are, and i hated mixing the oil and gas. That being said, i have a giant bag of parts that comes with this scooter. There are enough performance 2 stroke parts here to make this thing a noisy 35 mph monster again. 49cc 2 stroke motor with rocket key upgrade and torque added juice box upgrade. There are also different transmissions and gears to choose from to make it ride exactly how you want it to. I currently have the scooter geared as low as possible due to the 4 stroke engine. Because this scooter is essentially homemade at this point, I make no guarantees of any sort. You're buying it as it sits. It always rides well for me, and has been well taken care of. I change the oil (remember, 4 stroke!) Every 5 hours of riding, even though mfgr spec says 20 hours between oil changes, and I only use mobil1 synthetic. It's never even been rained on. I would be willing to sell the scooter and bag o parts separately as well. Scooter for 400, parts for 150. Keywords: scooter goped moped 2 stroke 2stroke performance parts upgrade 4 stroke 4stroke 49cc 49 cc