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This is the Go-Ped GP290RS COMPLTE TOP-END KIT 40mm (121130039).

Note: Newer GPL290 engines have this 40mm crankcase opening, they are not interchangeable with the older 38mm opening crankcases.

Product Specifications:

• 40mm Cranckcase Boss
• 36mm Bore
• GP290RS Complete Top-End Kit
• SKU: 121130039