M6 Carburetor Main Measuring Hole Nozzle 55-150 for Derotto PHBN PHVA Modification

This M6 carburetor main measuring hole nozzle is a practical component for anyone performing carburetor modification or tuning. Designed to fit Derotto PHBN and PHVA carburettors, it offers a broad selection of jet sizes ranging from 55 to 150, enabling precise fuel mixture adjustments. Whether you are optimising for performance, altering conditions, or rebuilding a carburettor, this nozzle provides the sizing flexibility needed for effective tuning.

Features and Construction

The nozzle is built as a straightforward, functional part with an M6 thread for secure installation. Each size is individually numbered for easy identification, making selection straightforward during assembly or adjustment.

Size Range and Options

The product is supplied in 30 individual sizes: 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, 88, 90, 92, 95, 98, 100, 102, 105, 108, 110, 112, 115, 120, 125, 130, 135, 140, 145, and 150. Each size corresponds to the main measuring hole diameter, allowing you to choose the specific jetting required for your engine configuration. The numbering system is standard for Derotto jets, enabling direct replacement or size changes without guesswork.

Compatibility and Fit

Designed for use with Derotto PHBN and PHVA carburettors, this nozzle matches the thread pitch and body dimensions of those models. The M6 thread ensures a firm fit into the main jet holder, reducing the risk of loosening during operation. It is intended as a replacement or modification part, not as a universal fit for all carburettors.

Material and Build

While the specific material is not listed in the source text, carburetor main jets are typically made from brass, chosen for its corrosion resistance and machinability. The nozzle is machined to consistent dimensions to maintain accurate fuel flow. No additional coatings or treatments are indicated.

Uses and Placement

This nozzle is primarily used in carburetor tuning and modification settings, where precise fuel metering is critical for engine performance.

Event or Professional Use

Mechanics and tuners working on motorcycles, scooters, or small engines using Derotto PHBN or PHVA carburettors will find this range useful for dyno tuning, competition setup, or maintenance. The broad size selection allows for incremental adjustments to account for changes in altitude, air filter modifications, or exhaust changes.

Everyday Home Use

Enthusiasts rebuilding or servicing their own carburettors can select the appropriate size to restore proper fuel delivery. Having multiple sizes on hand simplifies trial-and-error tuning without needing to source individual jets from different suppliers.

Benefits and Buying Value

The practical value of this product lies in its sizing variety and compatibility with a common carburetor platform.

Reuse and Low Maintenance

The nozzle is a single-piece component with no moving parts. Provided it is kept clean and free from debris, it will last as long as standard brass carburettor jets. No special maintenance is required beyond periodic inspection during carburetor servicing.

Why Choose This Product

This product offers a straightforward solution for carburetor tuning, with a single package containing one nozzle in your chosen size. It eliminates the need to purchase a full set if you only need a specific jetting. The compatibility with Derotto PHBN and PHVA ensures it fits directly, reducing installation time.