2-Stroke 50cc Electric Choke: Mikuni / Minarelli Engines

Reliable Cold Starts: 2-Stroke 50cc Electric Choke

Eliminate morning starting frustrations with the Universal Parts Electric Choke (Auto-Bystarter) Assembly. Specifically engineered for Mikuni-style carburetors found on 50cc 2-stroke Minarelli (1PE40QMB) engines, this component automatically manages the fuel-air mixture during startup. If your scooter struggles to stay running when cold or feels "bogged down" after warming up, a failing thermal wax motor in your original choke is the likely culprit.

Technical Performance Features

• Precision Thermal Actuator: Features a high-quality internal heating element that ensures the plunger extends at the correct rate, transitioning your engine smoothly from a rich "start" mixture to a lean "run" idle.
• OEM-Spec Plunger: The 7.98mm outer diameter plunger is precision-machined to provide a perfect airtight seal within the carburetor’s enrichment circuit.
• Plug-and-Play 2-Pin Connector: Equipped with a standard 2-pin male plastic plug for a direct connection to your factory wiring harness—no splicing or soldering required.
• Durable Weather Housing: The choke body is encased in a protective heat-resistant shroud to ensure consistent operation in all riding temperatures.

Comprehensive Fitment Guide

This choke is a primary fit for Taiwanese 50cc 2-Stroke Scooters using Mikuni or Mikuni-clone carburetors:

Technical Specifications

• Plunger Diameter: 7.98mm
• Mounting Hole Spacing: 30mm (Center-to-Center)
• Plug Style: 2-Pin, Male
• Wire Length: 7 Inches
• Engine Compatibility: Minarelli 1PE40QMB / 40QMB

Mechanic's Note: This choke is "normally open," meaning it allows extra fuel for starting when there is no power. Once the engine starts, it receives electricity to heat up and close the circuit. Pro Tip: If your scooter runs great for 2 minutes and then starts smoking or fouling plugs, your choke is likely stuck in the "open" position and needs to be replaced.

SKU: 114-77
MPN: 4746
Vendor: Universal Parts

40QMB 50cc 2-stroke, Various unlisted makes/models