Bore on GS500?

[GSJames]

What is the bore on it?  I know the site says 74mm, but my machinist said that the bore on the block looks like 78.8mm?

Something's not right, that's for sure.  The pistons I have fit it fine though?  I'm in the process of trying to get the sleeves honed.  I was told by Suzuki that it's 74.0mm bore with 1.5/1000" clearance (way to go zuki mixing imperial and metric like that).

Anyone have some insight on this?

[dgyver]

Stock is 74mm. The largest you can over bore the stock sleeves are 5mm which would be 79mm. It is possible that you have a set of 79's as they are stamped 78.8mm.

IRC   .002" was the clearance on the last bore I had done.