K1 pistons and rings in a F1

[UK Pete]

Does any one know if K1 oistons and rings work in a F1, if so are there any advantages or dissadvantages,
Pete

[steff750]

  off the top of my head i would say they would work,as long as they are the same size, a local engineer who has done work for me  would always bore the barrels too match the pistons and not just bore too a specified oversize ,i have mixed and matched k0- k4 bits over the years, i think the only real difference was in the f2 with the bigger chocolate valves, I'm sure some one will put you right soon enough

[Bryanj]

Not 100% sure but i think you will get a slightly lower compression ratio

[kaceyk2]

I cant remember Pete if the F1 had domed pistons the same as the F2, if it did then + one with the slightly lower compression...but it really would be very slightly lower....

[Spitfire]

The F1 pistons are not as domed as the F2, they are very slightly domed with small cut aways, here's a pic of mine.


Cheers

Den

[AshimotoK0]

There was a change somewhere in the production run of the F1 from flat to domed pistons. I have both types here but they are both stamped '392'. Some Ebay **** sold me barrels and pistons, supposed to be K1 but were F1 before I attended the ChrisR school of CB750 part identification. Shame as they have only done 20K.

cheers

Ash

[UK Pete]

Hi ash if you are considering selling give me a pm with details as i still do not have a top end for my cafe project
Pete

[AshimotoK0]

Hi Pete 

Can you send me a blank text so that I have your number and I will call you re: barrels and pistons

07515121226

Cheers

Ash