I run Seafoam in the fuel and oil. I did change the oil as soon as I got it, then again at 50, 100, 200 so far. Dennis, more pictures would be great as I'm a complete novice on scooters and doing my own mods. Any help is always very welcomed. And no, no synthetics . Sadly there was a hold-up on the muffler delivery but it will be here tomorrow. As for the original, I am getting sent a new one but I know it will never get installed. I will never sell this bike...I'll keep dropping new motors in it if I have to lol. I truly love it that much and it fits and suits me perfectly. It's the most solid, sturdy little bike I have come across. I took it out in 55mph head winds and the bike never flinched...I got beat to crap but the bike handled flawlessly. I'm only 4'10 and about 130lbs so this bike just flies for me. I took my step-daughter for a ride and not once did the motor ever sound strained.