. I'm pretty sure that it's the K03s on the AUM. Someone did a spec sheet for the various engine codes on here and thats what it says on there.
Depends on the engine code. AGU, ARZ (or something similair) and AUM all had 150bhp as standard. AGU has big port head, K03 and throttle cable AUM has small port head, K03s and drive by wire ARZ (or whatever it is) has some combination of the above.