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yep it was !!

thx guys much appreciated ! F2 pistons are ordered

So I found the pistons for the cb750 1977 on cmsnl, the first is for the supersport and the second just for the k model 1977, so I'm guessing from the picture it's the supersport ? The one that is more domed

Actually, if I compare that picture from your thread to mine, you can see mine is a F2 no ?

can't see any numbers... my engine is one hour from me so can't take more pics ... I'll try to go back another time, if what you say is right I'll have to return the new pistons I have and get new ones, I haven't been able to find F2 pistons as of now ... much easyer to find for the K

Here it is !!

It says B410 on the pistons, can't see on the top end

Here's the close up of the old piston, you can't see any cast numbers but you can see the honda, I've checked and the serial numbers for the engine is that of a K4 1974

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...