101 Octane QMB139 Emissions Head $54.99 Quantity discounts available QuantityPrice SKU: 155-28 This item is IN STOCKCurrent Stock: 2 Quantity -+ Add to Cart Details Specs Intake Port Diameter: 18mm Exhaust Port Diameter: 18mm Valve Length: 64mm Supported Models QMB139 50cc/49cc DetailsSpecsSupported Models Back 101 Octane Completely Assembled Emissions Style Cylinder Head for 50cc 4-stroke QMB139 engines with 64mm valves. Back Intake Port Diameter: 18mmExhaust Port Diameter: 18mmValve Length: 64mm Back QMB139 50cc/49cc