Rob, if I remember correctly, the serial number of your K-80 is in its 200s, since then, K-80 made quite a bit of improvements without announcing, faster response and better fuel efficiency....etc. but still, I have never seen an earlier K-80 with the acceleration as you described. Nevertheless, I'm glad you are enjoying it, keep in mind, latest technology in K-80 combustion chamber design could be upgraded if requested on your next service.

nipmuck2, Upgrading from an E to F (kero start) could be done, but probably not feasible since so many parts would have to be replaced.

Regards,
Barry