JE piston, 907cc (91.5mm OD, up from 89mm, so thats +2.5mm for those with the IQ of a fish). Up from 850cc.
Compression is also 12.5:1 up from 10.4 / 10.5:1 (depends where you read, it does differ a touch). Its surprisingly lighter than a stock unit aswell. And heres a comparison of a TRX (850cc stock size) TDM900 (900cc +2mm) and the new 907cc.
The gudgeon pin on the left is stock, right is the new JE.. the ID appears to be the same, but ive not measured to confirm. They appear to also be the same weight, altho again, i cant confirm. TDM is heaviest of the lot, followed closely by TRX, but the JE is surprisingly light. Which can only be a good thing..
It will get matched up to the new Carrillo rods ive got, and taken down to get properly balanced in the next day or 2.. Hopefully comes back within a week.