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Old 11-26-2011, 09:42 PM   #9
Retired Roadracer
Joined: Jun 2007
Location: Denver 'Burbs, Colorado, USA.
Oddometer: 6,147
Originally Posted by concours View Post
All japanese motorcycle pistons are offered in .5mm, 1.0mm, 1.5mm O.S., and so, the minimum bore is .5mm, (he didn't specify the amount needed to clean) way more than is practical to hone out.

You are incorrect here, Sir. Some OEM & aftermarket suppliers offer in increments of 0.25mm....especially in racing-specific engines. I know this to be true of the Suzi PE-175 - the Yamaha IT-175's ISDE arch-rival. It's worth a look-see in Yamaha's FREE online lookup to be sure.

*EDIT* I took a quick look on "" and saw that the 1982 model had 4 oversize piston kits available, in +0.25, +0.50, +0.75 & 1.0mm. I had not noticed the OP's model year, but I suspect that the same pattern follows for most years, based on my past professional experience with Yamaha.
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Duck_Pilot screwed with this post 11-26-2011 at 10:40 PM Reason: Fumbly fangerz.
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