pvincent04
CB750 Member
So I need to change my pistons on my cb750k4 1974, ordered new ones from vintage750.com, the new pistons don't have the same dome shape as the old ones. The old are tagged Honda, when I look at other sites or used pistons, they seem to have the flat shape like my new ones.
So If I install the new ones, I will loose compression, were the old pistons previously changed for more performance with other 61mm pistons from honda that are more conic ?? And if I change the pistons to the new ones I will basically go back to the original power and compression ?