RE: differences SQ, KM, and ???
It's a TQ (I think the same as SQ)
Shocks will be super stiff - drill out or replace stock pistons and oil.
Bolts for carb too long, add gasket and foam to air filter (or better yet, replace)
Replace steering washer arms (too short) with hpi stock or upgrade
Stock clutch spring seems super weak, but hav'nt pulled it yet (new ones in the mail)
I think those are the main things so far.
(and I took off the purple in most places, changed the wing)
From what I can tell, the newer KM's are about the same quality as these, but probably assembled better.