PHBG 21mm Racing Carburetor for 2-Stroke 70cc 90cc Big Bore

Product Overview

Build stronger top-end power with this PHBG 21mm racing carburetor, designed for 70cc–90cc 2-stroke big bore moped, scooter, and racing-style engine setups.

Compared with the 19mm version, the 21mm bore provides more airflow for higher-revving engines and modified cylinders. It is a better choice for riders running a big bore kit, sport exhaust, upgraded intake, or other performance modifications where the engine needs additional fuel and air at higher RPM.

This carburetor is suitable for many RS50, RX50, MX50, SX50-style, MBK 50, and similar 2-stroke platforms with compatible intake and cable setup. Proper jetting and tuning are required for best performance.

Product Compatibility

Category	Fitment
Engine Type	2-Stroke / 2T engines
Engine Range	70cc–90cc performance and big bore builds
Target Vehicles	Mopeds, scooters, mini bikes, small racing platforms
Example Platforms	RS50, RX50, MX50, SX50-style, MBK 50 and similar models
Best Use	Big bore builds, racing setup, stronger top-end power

Specifications

Specification	Details
Product Type	PHBG-Style Racing Carburetor
Bore Size	21mm / 0.82"
Engine Type	2-Stroke
Recommended Engine Range	70cc–90cc
Material	High-strength alloy
Application	Moped / Scooter / Mini Bike / 2T Big Bore Build
Condition	New

Key Features

• 21mm High-Flow Bore – Better suited for 70cc–90cc big bore and racing setups.
• Designed for Top-End Power – Supports higher airflow demand at upper RPM.
• PHBG-Style Adjustment – Allows tuning of idle, needle position, and jetting.
• Improved Air-Fuel Delivery – Helps support smoother acceleration on modified engines.
• Performance Build Ready – Ideal for tuned 2-stroke mopeds, scooters, and mini racing platforms.