Superb engines full stop.

My 2014 WCS Black Head v1 is my practice donkey, very fast (still) and all I've done is change the rod every 2-3 gallons. Still on original rear ceramic bearing (I did upgrade the front to the rubber seal, better idle), piston and liner.

My v3 red head is my race engine, similar story to above, just a little quicker at the top with same economy. Biggest issue is engine has more talent than driver!

The thing I notice the most is that they run (at race setting) 5.15 easy, that makes a big diff in a long final (I'm sure), but gives great flexibility when to pit (traffic). Compared to other engines I've run they like to be a little rich at the bottom, but the top then screams. They hold tune too. Oh and REDS pre-break-in ensures a sweet pinch on the P&L (always bought pre broken in).

Not got the diamond yet..... thinking maybe for my 2018 Serpent 988 drive :-)

Mario Rossi knows his stuff.