Keihin Style 4mm Main Jet - PB PAB CVK Carburetors for Scooters & Mopeds

Keihin 4mm Main Jet for Scooters and Mopeds

This 4mm main jet from the Keihin range is made for PB, PAB, and CVK carburetors. It gives riders a way to adjust the air-fuel mixture, which helps when the engine has been changed with parts like a big-bore kit or a high-flow air filter. It belongs to the group of scooter carburetors & jets that can help you get more out of your engine. It comes in several sizes so you can dial in the setup you need.

Build and Design Details

The jet has a compact round body with an M4x0.70 thread and a 5mm round head, matching the Keihin 99101-116 pattern. It is machined from brass, which allows the fuel flow to be metered accurately for steady engine running. There are 15 sizes available, from #75 up to #130, so you can pick the one that suits your application.

Fit Notes and Setup Tips

This jet suits OEM and aftermarket Keihin PB, PAB, NCV, and CVK carburetors, generally in the 17mm to 26mm range. When setting it up, start with a larger jet and work your way down if needed to avoid overheating the engine.

Specifications

• Jet Style: Keihin Small Round (99101-116)
• Thread: M4 x 0.70mm
• Total Length: 7.0mm
• Head Diameter: 5.0mm
• Material: Machined brass
• Available Sizes: #75 through #130 (15 sizes)
• Fits: Keihin PB, PAB, NCV and CVK carburetors (17-26mm) on 50cc-150cc scooters, OEM and aftermarket

Compatible Models

Works with:

• Buddy 50 (stock jet #74)
• Buddy 125, 150 (stock jet #90)
• RoughHouse 50
• GY6 / 139QMB 50cc and 150cc CVK carburetors
• TaoTao, Wolf, Ice Bear, Bintelli and others
• Select Honda, Yamaha, SYM 4-stroke models using Keihin CVK units

How to choose: Pick a Keihin Small Round jet with an M4 x 0.70mm thread and 5mm round head. Large Round and Hex styles will not fit.

Shop more: Scooter Carburetors & Jets · Scooter Parts