I have received an 2106, thanks Rody for the fast service!
Timing wise it must be a faster engine than all previous models, the crank has 5 degrees more opening and the transfer ports are 1 degree higher compared with the 2105. Also on the side where the opening was extended I predict the engine should give a faster response on the throttle

Funny thing is that the exact same crank timing is used with the 5 port "sports" R21-v2 I also got. The v1 version has 10 degree less opening..... It will be THE choice for the ENS stock class.