YS91ST ring work in a YS91SR? - HeliFreak
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Old 06-19-2012, 08:34 AM   #1
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Location: Vic, Australia
Default YS91ST ring work in a YS91SR?

Hi just wondering if the YS91ST ring will fit in the YS91SR engines?

I can't find any SR rings instock in Australia, but there is ST rings available.
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Old 06-22-2012, 01:16 AM   #2
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Dont think so, the sr has a longer stroke than the st so being the same displacement the ring is smaller on the sr.
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