Hoca 54mm Minarelli Big Bore Kit Tall, Part #169-340

Hoca Big Bore Head Kit for 90cc 2-stroke 50QMF, E50QMF, 1E50QMF and 1PE50QMF Minarelli engines. 54mm with 12mm wrist pin, includes cylinder head. This kit should be used with the Hoca 45mm Stroker Crank for optimal performance! Wrist Pin Diameter: 12mm. Wrist Pin Length: 44mm. Fits 1PE50QMB Minarelli based engines with 12mm wrist pin. Piston Diameter: 54mm. Overall Height (cylinder): 103mm. Takes stock 90cc (50mm engines) up to 54mm.