I've got a buddy who just put the new smaller KingTech 160's in his Sky master A-10. They are supposed to be smaller than the old 140 but I don't know where you'd find the specs for the old one.
You really dont need that much power- two King Tech 100s would be perfect and save on weight
Check the engine specs, that's not much of a weight savings. A K100 weighs 1300 gm., whereas a M140 is 1320 gm. So with two K100's you'd save 40 gm., or about 1.5 oz.
If you prefer Kingtech then you might want to consider the K120 which weighs 1280 gm. The K140 and larger are a bigger, heavier can. However, the hands down winner from a power/weight standpoint is the M140.