PROX

PROX 99101-357 Keihin Hex Main Jet 155

Precision Fuel Delivery for Optimal PerformanceThe Pro X 99101-357 Series Keihin Hex Main Jet is designed to provide precise fuel delivery for Keihin carburetors. Compatible with Beta 400 RR models from 2005-2014 and other machines, this high-quality aftermarket jet ensures optimal engine perform...

$16.95*
In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

Precision Fuel Delivery for Optimal Performance

The Pro X 99101-357 Series Keihin Hex Main Jet is designed to provide precise fuel delivery for Keihin carburetors. Compatible with Beta 400 RR models from 2005-2014 and other machines, this high-quality aftermarket jet ensures optimal engine performance and throttle response.

Specifications:

  • Style: 99101-357
  • Size: 155
  • Carburetor Compatibility: Keihin

Key Features

This product cannot be sold to residents in the state of California.

High quality aftermarket jets for Keihin carburetors.

Specifications

Brand
PROX
Part Type
Hex Main Jet
Jet Size
155
Compatibility
Keihin Carburetors

Pros & Cons

👍 Pros

  • This PROX Keihin Hex Main Jet 155 is a high-quality aftermarket component for compatible carburetors.
  • Designed for Keihin carburetors, it provides a specific and necessary replacement part.
  • The jet is engineered to precise specifications, ensuring proper fuel delivery for engine tuning.

👎 Cons

  • This product cannot be sold to residents in the state of California, limiting its availability.
  • The "155" sizing indicates a specific tuning requirement, making it unsuitable for general purpose use without knowing the correct application.
  • Installation requires knowledge of carburetor tuning and mechanics, which may not be suitable for all users.

Frequently Asked Questions

This PROX 99101-357 Hex Main Jet is designed specifically for use with Keihin carburetors.
This main jet has a size of 155, which is a specific calibration for fuel mixture.
No, according to the product features, this product cannot be sold to residents in the state of California.
The product is described as a "High quality aftermarket jet," indicating it is not an OEM part but a compatible replacement.