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need help with bore size is 81.5mm= 3.209?

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Old 10-29-2005, 09:57 AM
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Default need help with bore size is 81.5mm= 3.209?

I am trying to order a set of rings for my 81.5mm us itr pistons and they only have domestic size by inches.
Also is a 81.5mm a .20 over piston? I am getting confused on this build. I hate rare pistons. No one stocks a ring for this piston.
Old 10-29-2005, 06:09 PM
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Default Re: need help with bore size is 81.5mm= 3.209? (ghettocrxsi)

81mm = 3.1889in
81.5mm = 3.2086in

Yes 81.5 is a .20 oversized piston.
Old 10-29-2005, 06:17 PM
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yeah, thats semi correct. the bore sizes you gave are correct.

.010" = .25mm
therefore 81.5mm is a .020" oversize piston.
Old 10-29-2005, 08:03 PM
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Default Re: (RPRacing)

Alight guys thanks for the confirmation, now I just gotta find someone who stocks them.
Old 10-29-2005, 08:44 PM
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Default Re: need help with bore size is 81.5mm= 3.209? (ghettocrxsi)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ghettocrxsi &raquo;</TD></TR><TR><TD CLASS="quote">I am trying to order a set of rings for my 81.5mm us itr pistons and they only have domestic size by inches.
</TD></TR></TABLE>

Americans and they're darn stubborness to never go metric so instead we have to confuse the hell out of oneanother. Who you ordering from?
Old 10-30-2005, 09:44 AM
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Default Re: need help with bore size is 81.5mm= 3.209? (Haleiwa-Brando)

I had good luck with hastings in the past. I may buy from the dealer since I get a discount.
Old 10-30-2005, 10:40 AM
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well Honda only sells .25mm oversize so you will not be able to buy the OEM rings. try hastings again
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