Ignition -POLINI IDM- Vespa PX, Cosa -

Polini IDM ignition for Vespa PX with Elestart

With its IDM ignition, Polini offers an interesting alternative to the original ignition system. The basic idea here is also a significant improvement in acceleration due to considerably less flywheel mass. The pole wheel of the Polini IDM ignition weighs just 1.4 kg, which is over 50 % less than a standard PX fan wheel.

The resulting throttle response is fantastic and acceleration in the lower gears is much more aggressive. This is achieved by a lightweight design in which the rotor and fan are separate components. In this special version, the rotor has a ring gear for the electric starter. Polini is therefore the only supplier to offer such an ignition for Elestart models.

• Rotor weight: 1400 grams
• Also suitable for electric start models
• Also suitable for PX models from 2011 onwards
• Dynamic ignition timing adjustment by 8°
• Complete replacement ignition
• More agile acceleration
• More power
• More torque
• More spontaneous throttle response
• 90Watt light output
• Reinforced fan guard
• For original wiring harness/regulator from 1984 onwards

The ignition itself is based on a base plate of a 50cc automatic controller and has a frequency-dependent ignition timing control. This is dynamically designed and adjusts over the speed range in a pre-programmed ignition curve. The engine adjusts the ignition timing dynamically (i.e. with a change in speed) by 8° crank angle. In the example (in the installation instructions in the download area) you can see that the timing is adjusted from a statically set timing of 23° from 1300 rpm to 15° at 8000 rpm. If the ZZP is set to 26° statically, you end up with 18° at 8000 rpm.

The dynamic adjustment helps the engine to achieve good torque and clean combustion even in the lower speed range, in which any resonance exhaust that may be present does not yet have a good supporting effect. In order to relieve the engine thermally, the ignition timing is reduced again in the upper engine speed range, as it is generally well filled here. Systems that are powerful in the lower speed range, such as SIP Road or BGM BigBox, also benefit from this type of ignition. In contrast to a genuine resonance system, the pre-ignition can usually be increased significantly and the available torque can be increased considerably.

The ignition is a perfect replacement for the existing one and enables significantly more agile engine performance. On models from 2011 onwards, it is a prerequisite for further tuning, as it eliminates the rev limiter of the original ignition. The ignition is connected to the original wiring harness and operated with the original regulator. However, this only applies to models built from 1984 onwards. Models with an ignition lock on the handlebar cover still require a new regulator (ideally suited is BGM6690).

NOTE: Requires a pole wheel puller M22x1.5mm (see accessories).