I have an old two valver gs750 that had some mods performed on it before I purchased it. The bike shows signs of drag racing in its past (spoked rims are drilled so the tire doesn't spin, carbs from an old Z1) , but it wasn't till recently that I found it went deeper than that.
During last summer the head gasket began to leak and with that I decided to install some fresh gaskets. When I removed the jugs I found the sleeves to be really thin at the bottom, so much so that one of them chipped from just setting it on my stainless bench. I figured at this point that the bike must have been bored to 850 and had 850 pistons put in so I purchased a used set of jugs from an 850.
These jugs came in today and after measuring I have found that the pistons are even larger than that. The bore of the 850 cylinders sits around 68.95 mm while the actual piston is measuring closer to 69.40 and this is where my question lies... Are these pistons even from a GS? Just oversized? or would anyone recognize them from another bike? I am not sure whether to get these jugs bored to fit the pistons or to just buy new pistons that would fit a stock 850 bore? What do you guys think? Bare in mind I will have to bring it to a machine shop for boring (all I have is the ability to hone).
During last summer the head gasket began to leak and with that I decided to install some fresh gaskets. When I removed the jugs I found the sleeves to be really thin at the bottom, so much so that one of them chipped from just setting it on my stainless bench. I figured at this point that the bike must have been bored to 850 and had 850 pistons put in so I purchased a used set of jugs from an 850.
These jugs came in today and after measuring I have found that the pistons are even larger than that. The bore of the 850 cylinders sits around 68.95 mm while the actual piston is measuring closer to 69.40 and this is where my question lies... Are these pistons even from a GS? Just oversized? or would anyone recognize them from another bike? I am not sure whether to get these jugs bored to fit the pistons or to just buy new pistons that would fit a stock 850 bore? What do you guys think? Bare in mind I will have to bring it to a machine shop for boring (all I have is the ability to hone).
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