Main Jet for Keihin Style PB, PAB and CVK Carburetors- 4mm

Precision Tuning: Keihin Style 4mm "Small Round" Main Jets

Fine-tune your air-fuel ratio with these high-precision 4mm Main Jets. Designed for Keihin PB, PAB, and CVK series carburetors, these jets are the essential component for optimizing performance after installing a big-bore kit, exhaust, or high-flow air filter. These are "Small Round" (99101-116) style jets, featuring an M4x0.70 thread.

Technical Specifications

• Jet Style: Keihin Small Round (99101-116 Style)
• Thread Pitch: M4 x 0.70mm
• Dimensions: 7mm (Total Length) x 5mm (Head Diameter)
• Material: High-Grade Machined Brass
• Available Sizes: #75 through #130

Comprehensive Fitment & Compatibility

These 4mm jets are the standard for many OEM and aftermarket 50cc to 150cc carburetors:

Tuning Advice: Always start with a larger jet than you think you need and "jet down." Running too small (lean) can cause engine overheating and permanent damage. For a comprehensive guide, visit our Jetting Instructions Blog.

Note: Not compatible with Keihin "Large Round" (99101-393) or "Hex" (99101-357) styles. Please verify your jet dimensions before ordering.

Original Parts For Scooters SKUs 114-36-75, 114-36-80, 114-36-85, 114-36-95, 114-36-100, 114-36-105, 114-36-110, 114-36-120, 114-36-125 

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