Mantis, for what it's worth, Kymco issued a recall on the 2004 Super 9 that I never got. The cracks led to a catastrophic failure of the rear engine/trans casing while I was going downhill on a bridge at 40+mph. I slowed the scoot down and walked it home with the rear wheel 6" off center.
Kymco replaced the engine/trans even though the Super 9 was a few years out of warrantee . Be careful and take it in ASAP.
Wil B.
Broadview, IL
'71 Guzzi Ambassador
'91 Nighthawk
'04 Kymco Super 9
'10 Kymco Yaget 200gt