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+--- Thread: Yamaha Pistons - Long memories needed (/showthread.php?tid=8131)
Yamaha Pistons - Long memories needed - Charles P - 30-10-2022
Can anyone with a long memory recall which Yamaha piston has been used in a A7 in years gone by?
Thanks
Charles
RE: Yamaha Pistons - Long memories needed - Steve Jones - 30-10-2022
Do mean Yamaha or Honda?
Steve
RE: Yamaha Pistons - Long memories needed - Charles P - 30-10-2022
Yamaha bike pistons .
Not the Honda generator ones
C
RE: Yamaha Pistons - Long memories needed - Malcolm Parker - 30-10-2022
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.
RE: Yamaha Pistons - Long memories needed - Charles P - 31-10-2022
(30-10-2022, 03:05 PM)Malcolm Parker Wrote: 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
RE: Yamaha Pistons - Long memories needed - Paul N-M - 31-10-2022
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.
RE: Yamaha Pistons - Long memories needed - JoeRowing - 31-10-2022
YAMAHA ybr125 If I recall correctly is right for a A7 bore. Rusty old memory though so double-check
RE: Yamaha Pistons - Long memories needed - Terrytuned - 31-10-2022
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.
RE: Yamaha Pistons - Long memories needed - JoeRowing - 31-10-2022
Ah yes, the xj 900 is 58 mm iirc
RE: Yamaha Pistons - Long memories needed - Charles P - 31-10-2022
Thanks Terry and Joe. Useful information
Terry, I changed my email address a while back and the redirection must have run out
Charles