Needle Valve Assembly

The needle valve assembly in the M40 engine is responsible for precise fuel flow control within the carburetor. This assembly allows the operator to adjust the fuel-air mixture to optimize engine performance under varying operating conditions. Comprising a needle valve and a threaded holder (or valve body), the assembly provides fine-tuning capabilities, enabling adjustments based on the engine’s speed and load demands. The needle valve’s position within the threaded holder regulates the fuel flow into the carburetor Venturi, ensuring an optimal air-fuel ratio for efficient combustion.

Valve Body Assembly

Valve Body Assembly
The valve body assembly in the M40 engine comprises two integral parts that work together to regulate fuel flow within the carburetor. At its core lies the valve body, a precision-engineered component featuring a machined valve seat and fuel passages. The valve seat ensures a consistent seal, while the fuel passages facilitate controlled fuel flow...

Detent Spring

Detent Spring
The detent spring in the M40 engine's needle valve assembly is a small but crucial steel component that plays a vital role in providing precise control over the fuel flow. Designed to align with the knurls of the needle, this spring creates distinct positions or detents, allowing the operator to feel and hear tactile feedback...

Needle

Needle
The needle features a tapered end and a fine threaded section that allows for precise control of fuel flow. A set screw at the end allows the connection of a control arm. This component was used in the video NX Tutorial 4A - Sketch and Revolve on the Engineering Technology YouTube channel. NeedleJT File Needle-REV-ADownload

Needle Valve Bracket

Needle Valve Bracket
The needle valve bracket in the M40 engine is a chrome-plated steel component that serves as a support structure for the needle valve assembly. Valve_BracketJT File Needle-Valve-Bracket-REV-BDownload

Needle Valve Hardware

Needle Valve Hardware
The needle valve hardware is used to mount the needle valve assembly to the needle valve bracket. A set screw is also included to provide an adjustment extension to be fixed to the needle. 99461A520_Phillips-Rounded-Head-Thread-Forming-Screws-1PDF 91210A038_Alloy-Steel-Cone-Point-Set-ScrewPDF 99461A520_Phillips_Rounded_Head_Thread_Forming_Screws_step-1JT File 91210A038_NO_THREADS_Alloy_Steel_Cone_Point_Set_Screw_stepJT File
Valve Body Assembly

Valve Body Assembly

The valve body assembly in the M40 engine comprises two integral parts that work together to regulate...
Valve Body Overmolding

Valve Body Overmolding

Made through an injection molding process, the over-molding incorporates molded hose barbs, allowing...
Valve Body

Valve Body

The valve body in the M40 engine is brass, chose for its good strength, corrosion resistance, and ease...
Detent Spring

Detent Spring

The detent spring in the M40 engine's needle valve assembly is a small but crucial steel component that...
Needle

Needle

The needle features a tapered end and a fine threaded section that allows for precise control of fuel...
Needle Valve Bracket

Needle Valve Bracket

The needle valve bracket in the M40 engine is a chrome-plated steel component that serves as a support...
Needle Valve Hardware

Needle Valve Hardware

The needle valve hardware is used to mount the needle valve assembly to the needle valve bracket. A...