QMB139 Main Jet Kit

Did you get a performance air filter, exhaust, or a big bore kit, and need to tune your carburetor? This QMB139 (GY650) CV (stock carburetor) main jet tuning kit is  exactly what you need to dial it in. This kit comes with 10 main jets

 kit includes:

70, 75, 80, 85, 100, 105, 110, and 115 main jets

can also be purchase separately.