The gudgeon pin in a motorcycle connects the piston to the connecting rod. In the category of Engines and Engine Parts > Pistons and Piston Kits > Gudgeon Pin. Zipp: Triad BT49QT-12F1. Baotian: 50cc 139QMA Engine, 50cc 139QMB Engine, Apollo 10 BT49QT-9(A10), Apollo 12 BT49QT-9(A12), BT49QT-9, BT49QT-12, BT49QT-12D, BT49QT-20B2, BT49QT-20BB, BT50QT-9, BT50QT-11, BT50 Rocky 50, BT 125 T-12 Tanco/Rebel/Rocky, Big Panther 50 BT49QT-2, Chase 49 BT49QT-7, Eagle 50 BT49QT-9F3, Eagle 50 GT BT49QT-9F3(GT), Monza 50 BT49QT-21A3, Rebel 49 BT49QT-12C1, Rocky BT49QT-12E1, Scout 50 BT50QT-9, Speedy 50 BT50QT-3N, Sprint 50, Tanco 50 2 BT49QT-12, Tommy 50 BT49QT-11, Warrior 50 BT50QT-12.