Crankcase Assembly; Newer Type w/40mm Crankcase Boss GPL290, GP290RS (121130020)

Crankcase Set with 40mm Crankcase Boss (Crankcase Opening) (GPL290, GP290RS).  

Includes:  Main Bearings and Seals Pre-Installed.  Also includes the center-case gasket.

Note:  The 38mm (older style) and the 40mm (newer style) are not interchangeable.  The cylinder skirts can also be measured outside to outside to determine proper case measurement)