Thank you so much for the info,I did check the service manual and it just references tolerances for the cylinder.I figured it was the same engine,BUT I needed someone else to be on the same ship as I am. Thanks again.

putting a new top end in my 2018 trail 500,looking at cylinders I see 2 options, Mark 1 or Mark 2, what are the differences or how are they identified ? also do the zforce 500 and 550 run the same engine, they are both listed as 495cc. thanks.