Keihin Idle Pilot Jet for PB / CVK Carburetors - GY6 & 50cc

Eliminate rough idling and low-end bogging with a precision-calibrated Keihin Idle Jet.

The Keihin Idle Jet (Pilot Jet) controls your scooter's fuel mixture from 0% to about 25% throttle. If your bike struggles to stay running at stoplights or hesitates when you twist the throttle, your idle jet is likely clogged or incorrectly sized. These high-quality brass jets are designed for Keihin PB and CVK style carburetors found on most Genuine 50cc and GY6 50cc scooters.

Detailed Model Fitment:

• Genuine Scooter Co (50cc 2-Stroke): Buddy 50, RoughHouse 50, Rattler 50, Black Cat 50
• Chinese GY6 50cc (139QMB): Fits PD18J and CVK style carburetors used on TaoTao, Wolf, Ice Bear, and Bintelli.
• Carburetor Compatibility: Keihin PB Series and most 18mm-20mm CVK clones.

Key Features:

• Precision Flow: Calibrated internal bore for consistent fuel delivery at low RPMs.
• High-Grade Brass: Corrosion-resistant material ensures long-term tuning stability.
• Available Sizes: Select from #38, #40, or #42 to match your specific engine needs.

Tuning Tip:

If you have upgraded to a performance exhaust or a "Big Bore Kit," you often need to move up one size (e.g., from a #38 to a #40) to prevent a lean condition. Jetting is a process of trial and error. 

Technical Specifications:

• Type: Keihin PB / CVK Idle (Pilot) Jet
• Material: Machined Brass
• SKU: JETKH2