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Ignition systems for vintage mopeds

The ignition produces the spark that brings any internal combustion engine to life. Choosing the right setup is not just a simple maintenance task: it is the guarantee of a reliable start, stable lighting, correct charging, and optimal engine response. From original systems (electronic or points-based) to racing ignitions, you will find parts here from renowned brands such as MVT, Italkit, Malossi, Polini, or PVL. Spare parts and conversion kits are also available.

Ignition components and their function

The ignition system consists of a few essential elements. In the event of a breakdown, it is usually a single defective component. Identifying and replacing it gets the vehicle back in working order. In our ignition section, you will find all the spare parts and accessories needed to maintain, repair, or improve your machine without complications.

Rotor (flywheel): Rotating with the engine, it creates the magnetic field that allows the stator to produce electricity.
Stator: A set of fixed coils that, combined with the rotor, generates the current necessary for ignition and potential battery recharging.
Pulse sensor (pick-up): Found on electronic CDI systems, it detects the crankshaft position and sends the signal to trigger the spark. Note: points-based systems do not use one.
CDI: Electronic module that processes the pulse signal and sends a high-voltage discharge to the coil. Available in AC or DC versions, with fixed, variable, or programmable advance.
Contact breaker (points): Mechanical switch used in traditional systems. It opens and closes the primary circuit to produce the spark. Requires a quality capacitor and periodic adjustment or replacement.
Ignition coil: Amplifies the CDI signal to provide a powerful and crisp spark.
Spark plug cap and lead: Carry the high voltage from the coil to the spark plug.
Spark plug: Key element of the ignition: it ignites the air/fuel mixture and starts the engine.
Regulator (AC) / Regulator-rectifier (DC): In alternating current lighting circuits, a regulator limits the voltage to protect the bulbs. When direct current is required (battery, LED, USB port), the regulator/rectifier converts and stabilizes the output to approximately 12V DC. Essential for reliable 12V conversions.
Kill switch: Immediately interrupts the current: an essential safety element on any machine.

Comparison: main types of ignition for classic mopeds

→ Points-based / Traditional mechanical ignition

Features:

Contact breaker (points) and capacitor.
Typical of original restorations.
Often associated with a low-power 6V stator.

Advantages:

✅ Simple, repairable in the field, and faithful to the original.

Disadvantages: Regularly goes out of adjustment. The advance is less precise than an electronic CDI.

Tip: Use points that comply with the original specification and a quality capacitor. Consider an electronic conversion for greater reliability and less maintenance.

→ Original or OEM-type electronic ignition

Features:

Fixed advance.
External rotor.
Optimized for easy starting, good low-end torque, and smooth riding in urban environments.

Advantages:

✅ Reliable, durable, and low maintenance: perfect for daily use.

Tip: Choose a replacement model identical to the original, compatible with the vehicle's electrical harness.

→ Internal rotor competition ignition

Features:

Fixed or variable advance.
Internal rotor.
Often available in complete kits.
Power output for lighting depending on the model.
Designed for tuned engines and competition, with optimal spark energy across the entire RPM range.

Advantages:

✅ Sharper response, extended maximum RPM, and ignition curves optimized for performance.

⇒ Recommendations: Stage6 MK2, MVT Digital Direct / Premium, Italkit Selettra.

Some internal rotor kits offer a regulated 12V lighting output, combining track performance with road use. Available power generally varies between 30 and 80W. Some models allow voltage stabilization via a small battery or a capacitor.

Excellent choices: MVT Premium / DD and Malossi Power for many classic mopeds. Always check wiring compatibility and exact power output.

Original vs. tuning ignition on mopeds

Original ignition: prioritizes reliability, longevity, and simplicity; ideal for daily use and faithful restorations.
Tuning / racing ignition: intended for modified engines; programmable CDI, variable advance, and lightened rotor for better response and increased performance at high RPM.

Many old 50cc engines run on 6 Volts with limited electrical power. Switching to 12 Volts requires a compatible stator and a suitable regulator (AC) or regulator/rectifier (DC), as well as a matching CDI/coil. It is also necessary to replace the bulbs, horn, and flasher unit (as well as any voltage-sensitive accessories). DC-CDI systems benefit from a small battery. A high-capacity capacitor can replace the battery but provides less stable lighting at idle.

Warning: Timing and the advance curve significantly influence the power and temperature of a small 2-stroke engine. Too much advance increases the risk of overheating and knocking, while excessive retard degrades low-end torque and starting. Always follow the manufacturer's specifications and check with a strobe light if the CDI has variable advance.

Ignition problems - Quick diagnosis

⚠ SYMPTOM	PROBABLE CAUSE
Engine won't start / no spark	Faulty spark plug, faulty CDI or coil, damaged stator or pick-up, kill switch activated
Starts but spark is weak	Faulty coil, damaged CDI, dirty spark plug or incorrect gap
Intermittent spark	Unstable CDI, loose connections, damaged wiring
Unstable idle / engine stalls	Faulty CDI, failing spark plug
Battery not charging (CDI-DC)	Faulty regulator, dead battery, no stator output
Headlight too bright / bulbs blowing	Faulty regulator
Cold or hot start problems	Faulty spark plug, heat-sensitive coil, intermittent CDI

⚠ A damaged crankshaft seal or incorrect carburation can mimic ignition failures, even if the electrical system is in good condition.

FAQ – Frequently asked questions about ignition systems

→ Do I need to replace the entire ignition system?
Not necessarily. Often, changing the CDI, coil, cap, or spark plug is enough. Proceed by elimination before replacing the complete assembly.

→ Which type of ignition should I choose?
For daily reliability and faithful restoration, go for original parts (points or OEM CDI). For a tuned engine or track use, choose an internal rotor system with variable or programmable CDI. If road lighting is required, select a kit offering a regulated 12V output.

→ If I switch from 6V to 12V, what else do I need to change?
All bulbs, the horn, and the flasher unit, as well as any voltage-sensitive accessories. Ensure the stator and regulator/rectifier are compatible and correctly wired.