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Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Tue Apr 21, 2015 10:00 pm
by normanmike67
Until I can find rings, pistons are on hold. Yamaha 57.0mm (+1.0mm O/S of FZR400) are out of production
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Tue Apr 21, 2015 11:25 pm
by skinnydog0_0
Not sure if these are any good but they are honda 57mm pistons so a possible??
http://www.classicracereplicas.com/prod ... rod_anchor
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Tue Apr 21, 2015 11:27 pm
by lukemillar
Those are 2 stroke pistons!
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Tue Apr 21, 2015 11:28 pm
by skinnydog0_0
Yer but could the rings be used?
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Wed Apr 22, 2015 2:31 am
by normanmike67
2 stroke rings are not compatible
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Wed Apr 22, 2015 7:53 am
by skinnydog0_0
Yer silly idea really, but you never know

How about these guys?
http://www.ringleader.net/
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Thu Apr 23, 2015 8:20 pm
by crazyman
zxr400 start at 57mm , will messure as i have some fzr rings here as well
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Wed Jul 22, 2015 8:03 am
by Yakama
g-force performance wrote:I currently have a request in to both Cosworth, and my new piston vendor for quotation. My new vendor will have a longer delivery time because they want to build true forging tooling. This will make the pistons even stronger, and less expensive. The new vendor has made me a few sample sets athat are absolutely outstanding Quality - as they should be. They are the same supplier that makes many OEM pistons that we are familar with, as well as the piston for some well established F-1 Engine builders.
The bigger delay is, I just found our that Yamaha has discontinued the rings I was using from the FZR400. This is really bad news as it means that I don't have a ring for the pistons at this time. I have asked the piston companies of they can make the rings as well. Also, I have something on the works for an alternate solution that I should know for sure about shortly.
So, hang tight. If the new vendor comes through, I can get these piston kits significantly down in price. We shall see.
Mike Norman
Hi Mike
Any progress with the Pistons?

Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Mon Nov 23, 2015 9:09 am
by panteleimon
Hi Mike,

Like Yakama posted, any progress on sourcing the rings & pistons?
Cheers.
Re: Cosworth 57mm Pistons HAVE ARRIVED
Posted: Mon Nov 30, 2015 6:53 pm
by Variablevalves suck
So from what I understand its across the board with pistons,
i.e all manufacturers are out.
So question is does anyone know what the zxr guys use as its the most commonly races 400 so they got to be using pistons.
I know they were bigger bore than the Honda but could be used with a little work.