Hoca 54mm Minarelli Big Bore Kit, Part #169-154
Hoca Big Bore Head Kit for 90cc 2-stroke 50QMF, E50QMF, 1E50QMF and 1PE50QMF Minarelli engines. 54mm with 12mm wrist pin, includes cylinder head. Wrist Pin Diameter: 12mm. Wrist Pin Length: 44mm. Fits 1PE50QMB Minarelli based engines with 12mm wrist pin. Piston Diameter: 54mm. Overall Height (cylinder): 102mm. Takes stock 90cc (50mm engines) up to 54mm.