Yamaha Pistons - Long memories needed

[Charles P]

Can anyone with a long memory recall which Yamaha piston has been used in a A7 in years gone by?

Thanks

Charles

[Steve Jones]

Do mean Yamaha or Honda?

Steve

[Charles P]

Yamaha bike pistons . 
Not the Honda generator ones

C

[Malcolm Parker]

Isn't the trouble with modern bike pistons that they are designed for over-square engines with a very short stroke?  I think there have been problems resulting from the use of such pistons in Austin 7 engines.

[Charles P]

Isn't the trouble with modern bike pistons that they are designed for over-square engines with a very short stroke?  I think there have been problems resulting from the use of such pistons in Austin 7 engines.

Thanks Malcolm. It was the piston rings I was interested in, but that's an even odder question to ask

Charles

[Paul N-M]

Hi Charles,
Not sure if this is of any help.
I have used Honda 500/550 Four pisons and of course their rings and have had good results. These engines are moderate to high revving. I think spares (rings) are still available from specialists.

[JoeRowing]

YAMAHA ybr125 If I recall correctly is right for a A7 bore. Rusty old memory though so double-check

[Terrytuned]

Charlies,  Yamaha piston rings for slipper pistons available in std 4GA-11603-00  +.5mm 4GA-11605-00 +1mm 4GA-11607-00  57mm, 57.5mm 58mm. From Yamaha dealers fitted to XJ550 and XT125, sent email but bounced back, I have another supplier if you can't find them email me. Terry.

[JoeRowing]

Ah yes, the xj 900 is 58 mm iirc

[Charles P]

Thanks Terry and Joe. Useful information
Terry, I changed my email address a while back and the redirection must have run out

Charles