The Axial .28RR is a major disappointment. When I tore both of mine down, I was at first pleasantly happy to see many race grade innovations in it: domed piston top, turbo plug button head, turbo scallop on the crank, scooped pointed leading edge on crank, ports with flow channels cut in them.

What really disappointed me to no end was the timing profile. When I put the calipers, micromoters, and degree wheel to it, it had teh EXACT same timing profile as a Kingstar-Nitrostar K4.6! So, ALL of those race innovations put into it are utterly WASTED. Moreover, since Axial bought this same engine from the factory that also makes HPI's Nitrostar-Kingstar engines, the materials were also just as poor. Nothing like an OS , Picco, or Rossi materially.