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Message: <blockquote data-quote="ossagp" data-source="post: 196729" data-attributes="member: 1650">If it was mine I would be really interested in what actual size the piston is.  110 is not a common size.  It usually takes stroking to get an 80-85 that far.  Usually when you overbore one,  if the compression and squish is adjusted as well as port timing the rig will take smaller jets to achieve the air fuel mix just based on the displacement increase. All assuming the carburetor stayed the same size.  I have seen some of them (125's for the most part) that needed to be jetted way up to prevent detonation and the seizures and preignition that can follow.   That happens if the head work isn't done along with it,  and one of the reasons that people who have owned big bore kits use race fuel.  (that in itself is not always a cure all if the machining wasn't done right.)</blockquote>