NCY CVK Main Jet 138 (139QMB, GY6)
Description: NCY CVK Main Jet #138 for 139QMB 49/50cc, GY6 125/150cc+ CVK carburetors, 250cc 4-stroke water-cooled 172mm carburetors, and virtually any 5mm main jet slot CVK carburetors. Jetting is something that takes trial and error to get tune just right for your ride, rider, and environmental conditions. So grab a few sizes and have fun learning to tune and jet your CVK carburetor! This will not only help increase performance but the overall health of your engine 'lean' or 'richer' mixture of air to fuel.
NOTE: Will work on 139QMB CVK carburetor (Part# NK200.06) that accept 5mm main jet ONLY. Most commonly found on GY6 125/150cc+ CVK carburetors.
Includes the following piece's main jet.
• Main Jet Size: 138 RPM
• Keihin Round Style Main Jet
• Thread Size: M5 x 0.8mm
• Overall Length: 8mm
• Fit 5mm Main Jet Slot
• Fit CVK Carburetor
• Fit GY6 125/150cc+
• Fit QMB 49/50cc+
Supported Models: GY6 139QMB 49cc-50cc 4-stroke, 50QMF 90cc-100cc, 152QMI 125cc, 157QMJ 150cc, 161QMK 170cc, Chinese Scooter, ATV, Genuine Buddy, Kymco, Polaris RZR 170, Ruckus, TaoTao, Vento, and virtually any 5mm main jet slot CVK carburetors.
Item Weight & Product Dimensions:
• 0.0012 pounds | 0.315" (L) x 0.235" (OD) x 0.190" (ID)