▁cam sh aft s ▁designed ▁to ▁get ▁the ▁val ves ▁to ▁full ▁lift ▁quick er , ▁and ▁fitting ▁Mik uni ▁ 3 4 mm ▁car b ure t ors ▁to ▁it ▁for ▁sm o other ▁air flow . ▁The ▁cyl inder ▁heads ▁were ▁also ▁given ▁a ▁new ▁comb ust ion ▁chamber ▁with ▁a ▁' squ ish ▁zone ' ▁and ▁port ing ▁& ▁pol ishing ▁from ▁the ▁factory . ▁To ▁maintain ▁reli ability ▁oil ▁pass ages ▁were ▁installed ▁under ▁the ▁p ist ons ▁for ▁increased ▁cool ing , ▁and ▁an ▁oil - co ol er ▁was ▁added . ▁ ▁The ▁GP z 7 5 0 ▁was ▁the ▁quick est ▁factory ▁ 7 5 0 , ▁as ▁Cy cle ▁World ▁recorded ▁a ▁time ▁of ▁ 1 1 . 9 3 ▁seconds ▁at ▁ ▁in ▁the ▁ 1 / 4 ▁mile . ▁The ▁GP z 7 5 0 ▁under w ent ▁some ▁significant ▁changes ▁in ▁ 1 9 8 3 . ▁The ▁original ▁was ▁based ▁on ▁the ▁ 1 9 8 1 ▁K Z 7 5 0 - E . ▁K aw as aki ▁retired ▁the ▁K Z 7 5 0 ▁after ▁ 1 9 8 3 . ▁The ▁ 1 9 8 3 ▁K Z 7 5 0 L 3 ▁was ▁nearly ▁identical ▁to ▁the ▁' 8 2 ▁GP z 7 5 0 , ▁but ▁for ▁different ▁colors , ▁no ▁b ik ini ▁fair ing , ▁and ▁without ▁the ▁port ing ▁& ▁pol ishing ▁in ▁the ▁cyl inder ▁head . ▁ ▁In ▁ 1 9