REBORE 450cc

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piccio

XS400 Project
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Hallo all! (Ciao tutti: italian version...)
I'v got a project on going since 1 year: realize a Dirt Track from my XS400 '78.
I'd increase power (torque) , to have this I'd rebore it from 69=391cc to 74=450cc.
So I need new sleeves, quite easy to do, but first problem is to find pistons quite similar....!:banghead:
Do anyone know if SR250 pistons have same dimension (eccept bore, obviously) of xs?
Standard SR250 piston is 73.5 that is 440cc by using original crankshaft...
Anyone tried first?:confused:
 
Welcome piccio! I'm not sure about the SR250 pistons, but I believe there is a fellow on the DOHC forums that has retrofitted GSXR750 liners and pistons into the SOHC XS. I will try to find it as soon as I can!
 
I hear about it , but katana (suzy GSXR 750) has 4 valves...
If someone interested we can also buy a 4 cilinder set and split it : fifty fifty....
But quite sure that SR250 piston could be the right choice (I have to verify diameter pin).

Thank you very much!
(sorry about my poor english)
 
I believe the user was CrazyPJ or whatever username has on that site. Piccio, your English is very good, nothing to apologize for...
 
OK guys...
tomorrow I'll ring my spare-pusher to buy sr250 used piston.
It could takes some days... but only option I have is to try!

All opinons are welcome...
 
I have planned to bore mine out next winter so please keep us posted.
Also as a last resort you can always order custom pistons but i dont know how much they cost, i bet not cheap tho.
 
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