Description All the studs in one place! Both the head and cylinder studs for a QMB139 50cc scooter. Blue Line Exhaust and Cylinder Stud Set; QMB139 Engine Other products by BLUE LINE SKU0500-1087 - + Retail Price: $3.00 Your Price: $3.00 In Stock Add to cart Add to wishlist Have a Question about this item? Click here to email us. Also in Category Yamaha Zuma 50 2T Stage 2 Performance Kit; Horizontal Price: $580.00 QTY: Add To Cart Stud, Cylinder 8 mm-VSX Price: $4.00 QTY: Add To Cart Pinasco Racing Kit (225cc, Crankshaft); Vespa P200E, PX200 25361004 Price: $850.00 QTY: Add To Cart Pinasco Racing Kit (190cc, Crankshaft); Vespa PX, Stella 2T 25361002 Price: $675.00 QTY: Add To Cart