Prima Keihin PB Main Jet Kit (4mm, 10 pcs); 139QMB, Gen 50cc

Prima's 4mm main jet kit for Genuine 50cc scooters and 139QMB bikes running CVK carbs includes jets in 10 different sizes: #70, #75, #80, #85, #90, #95, #100, #105, #110, and #115. 

Original Parts For Scooters SKU 114-49-10PCS, 114-85-10PCS

Specifications:

• Round, Keihin PB style jets
• Kit contains 10 different jet sizes: 70 - 115
• Overall Length: 7mm
  
• Jet Body Diameter: 5mm
• Jet Thread Size: M4 x 0.7mm fits 4mm main jet ports.
• 70 Main Jet Inner diameter: 0.70mm (70)
  
• 75 Main Jet Inner diameter: 0.75mm (75)
• 80 Main Jet Inner diameter: 0.80mm (80)
• 85 Main Jet Inner diameter: 0.85mm (85)
• 90 Main Jet Inner diameter: 0.90mm (90)
• 95 Main Jet Inner diameter: 0.95mm (95)
• 100 Main Jet Inner diameter: 1.00mm (100)
• 105 Main Jet Inner diameter: 1.05mm (105)
• 110 Main Jet Inner diameter: 1.10mm (110)
• 115 Main Jet Inner diameter: 1.15mm (115)
• Packaging may vary from product photos

Compatibility:

Jetting takes trial and error to obtain optimal performance from your scooter. Many scooters are jetted lean from the factory to meet emissions requirements. Learn more on our Carburetor Jetting 101 page. Additionally, there are many good tutorials on how to properly jet a carburetor and you should refer to them to ensure you do not damage your engine by jetting too lean.

About Prima: Prima is the industry leader in premium scooter accessories, service parts and scooterist protective apparel. Prima brand products are designed direct-fit for all popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy and GY6 / QMB powered scooters.

Brands: Amstar, Amigo, Ascend, Baotian, Bashan, Blade, Boom, Chicago Scooter Company, Dongfang, Roketa, Baotian, Bashan, BMS, Cool Sports, E Ton, Fly Wing, Eagle, Fly, Italica, Riya, Ice Bear, Jackel, Jet Moto, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, Keeway, KMD, Kymco, Lance, Lifan, Linhai, Loncin, Longbo, Fuxin, Jiajue, Tao Tao, Tao Motors, Trailmaster, Maxtrade, Meitien, Motofino, Motorino, NST, Panterra, Panther, Qlink, Yiben, Red Streak, Redcat, Roketa, Schwinn, Strada, SYM, Tank, Terminator ,Tomberlin, TNG, United Motors, Vento, Vitacci, Wildfire, Wolf, X-Treme, X-Pro, Yongfu, ZNEN, Zhongneng , Zhilong, Geely, Wangye, ZH and more Manufactured by: Taizhou Zhongneng Motorcycle Co.; Jiangsu Zhongneng Motorcycle Co.; Jiangsu Meijunte Technology Co.; Taizhou Qianxin Vehicle Co.; Ningbo Dongfang Lingyun Vehicle Made Co.; Taizhou Zhilong Technology Co.; Zhejiang Jiajue Motorcycle Manufacturing Co.; Zhejiang Gelly Ming Industrial Co.; Taizhou City Senglong Motorcycle Manufacture Co.; Jiangsu Sacin Motorcycle Co.; Jiangsu Linhai Power Machinery Group Co.; Zheijiang TaoTao Vehicles Co.; Zhejiang Senling Motorcycle Co.; Sanmen County Yongfu Machine Co; Taizhou Jiaojiang Zhiwei Motorcycle Manufacture Co.; Huzhou Daixi Zhenhua Technology Trade Co.; Taizhou Zhongneng Motorcycle Co.; Zhejiang Riya Motorcycle Co.; Ningbo Longjia Motorcycle Co.; Taizhou Zhongneng Motorcycle Co.; and more