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Tries, did you say the stock rear pulley on another kymco model doesn't have the hump/weld? What rear pulley are you using?

Welcome to the Super 9 family.  I looked at the pics you posted on 49cc scoot and I gotta say that I very much doubt that kymco will replace the engine for a couple reasons. First the bike is 12yrs old and the model is discontinued  (even though the engine series is not),  but even more so is the fact that the damage/sludge isn't a manufacturer defect.  I suspect that the bike. Was stored outside and probably didn't have a sparkplug installed/loose plug or if it's an LC perhaps a seal or packing let go. Either way, it comes down to an owner (not you)  related maintenance issue, for which Kymco will probably not be willing to cover (even though it's really no skin off their butts as they made like a gazillion SF10 motors and only cost them like $10 per unit) I hope you luck. If I had a cylinder and piston to donate, I would. Keep us posted and we'll keep our fingers crossed.

Still nothing. Idle is all the way out (min open position), brass screw all the way in. Tried palm choking the inlet and nothing. I smell fuel, checked spark. Spark can be seen but the lightning bolts are thin and all over the electrode element.

Thanks guys. I tried again today, but no luck. I think it's getting too much fuel and not enough spark. The plug is getting wet with oily gas. Might drop down my main jet or idle jet and try again.

No port on the intake as it was hacked off when I modded the manifold as the Dell replica had all the ports needed. I'll try this configuration and see how it goes. 

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Crap, wish I was linked here earlier on.