Recently partially stripped my '18 Spade to do a valve adjustment; shed been loaned out for a bit and came back rather ticky.
This job is a bit of a pain, since you need to remove the grab bar, seat, left blister, fuel tank ( two fuel connections and two electrical connections) plus the upper motor mount (disconnect the horn) to do the job. You also need to separate the valve cover seal from the cover in order to squeeze the cover out of the frame. The job itself wasn't too hard, but I ran into a small issue when removing the tank.
The line from the fuel pump to the injector retainer is crimped on both ends. Rather than cutting and re-crimping the line, it seemed easier to remove the single 8mm bolt and the injector retainer. Came apart easily enough, but the injector seals were already starting to crack. Unseating and reseating the injector in the retainer triggered a fuel leak.
If you look in Kymco's parts catalog, the seals aren't sold separately from the injector. Fortunately, with a bit of luck and help from the local O'Reilly counterman, I have a fix for this.
If you need a replacement injector seal kit, Standard Motor Products makes a universal injector seal kit (part # SK53) which is a perfect match for the Spade's seals. They fit easily and solved my leak.
Hope this helps the other Spade riders out there.