Hey everyone, I tore down the top end of my 1974 CB740k4 that I purchased last winter for a project bike. To my surprise it has a 836cc Wiseco Big Bore Piston kit installed. I need to get new piston rings for it but I am not sure what size to get. The sizes come in 64mm and 65mm. The bore size is 64.94mm. This is where I plead ignorance, I am not sure if I am supposed to measure the piston diameter, or the recessed part of the piston where the ring sits. I have read that I will have to file down the piston ring to get the correct fitting so everything logically tells me that I should go with the 65mm set of rings. But I thought I would double-check here first.
I bought the ?Hondaman book, as well as the service manual; most of the information in there just talks about tolerances and how to fit the rings. And everything I read online touches on STD size and oversized rings by.10, .20, etc.
Thanks all!