This is still very much a work in progress, you can see from the photos the heads and valvetrain need quite a bit of work but the pistons seem to be situated in their respective cylinders so he’s at least part way there.
There’s very little information on his website. But at least it will be the same as 125 with 2 valve, while valves of 27mm and 23mm, the cylinders bore x stroke 56mm and 43mm.
