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There are no more items in your cartFor installation on Jog90 3WF engine it is not needed to enlarge crankcase. Just plug and play.
But for installation to Jog50 3KJ engine boring is required.
Big bore air cooled kit 110cc for Yamaha Jog90. It can also fit Jog50.
Kit includes: ceramic cylinder kit 54mm with head, crankshaft 45mm, crankshaft bearings, oil seals, needle roller and spark plug.
For installation on Jog90 3WF engine it is not needed to enlarge crankcase. Just plug and play.
But for installation to Jog50 3KJ engine boring is required.