Yes that hummer is a Shenqi (spelling)
The engine problem was a piston ring. I took all 3 of my 26 Zens to Just_Geralds and on need a ring, one needed a ring and piston and the other needed a ring, piston and head. Now I took you suggestion and vented the fuel tank out the back after a few cross body loops and I am good to go in this hotter weather. The piston ring gap could be measured with a tape measure rather then a 0.025" feeler guage.
PBJT