Because by the time a Kawi becomes "vintage", you have worked on it so much that you have already become a master mechanic.....:mrgreen:Welcome to the forum Tony. There a few mbr's with 550's so I'm sure somone has one but you might have better luck asking in the vintage section. I'm not sure if those guys check this section that often.
No, the H1/H2 is the GPz. I think the LTD's were an E model, but don't quote me on that. (And the wiring diagrams are probably pretty similar, but may not be exactly the same)Here is a link to a 1983 Z550 H2 wiring diagram. I don't know if the H2 model is the LTD, but it should be useful even if it isn't exact.
KZrider.com