Peugeot 103

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The Peugeot 103, in its many versions, is one of the most common Peugeot mopeds. The major variations include the LVS-U3 and the 103 SP, which differed mostly in body styling. In Bermuda, the most typically found Peugeot is the MVL. It featured a square headlight, headlight fairings, clamp-in handlebars and 5 star radaelli mag wheels. All three use the 103 variating reed valve engine.

Electrical

These mopeds came equipped with two different magneto systems made by Novi, the two coil and five coil magnetos. The two coil systems are notoriously fallible, and is probably the number one problem with Peugeot mopeds today. The best guess going is that the coil produces too low a voltage to produce a spark at low RPMs, resulting in poor running or poor idling conditions. The condensers may have something to do with it, as a uncertain spark is often associated with arcing points, a sign that the condenser is not doing its job. The magnets in the rotor are also suspect, as they feel much weaker that those found on other ignition brands.

Some solutions to the Peugeot ignition problem are:

  • Replace the old internal ignition coil with a new one, not a NOS one.
  • Grounding the black wire from the magneto, eliminating the kill switch and brake lights, but sometimes improving the spark.
  • Replacing the ignition coil with a NOS one, though this rarely has any effect.
  • Modifying a Bosch ignition coil from a Puch to bolt to the magneto, and using a Puch high tension coil in cooperation with the new ignition coil.
  • A puch coil needs to be spaced properly to work in a Peugeot ignition. Shim washers between the stator and the coil. Get the coil as close to the flywheel as possible without rubbing.
  • There is also the rectifier block, and reactance coil to consider, but there is little proof these pieces effect the ignition system at all. A good running Peugeot can be stripped of almost all wiring and components and still run with the black wire and lighting wires grounded.
  • Wiring the moped completely independent of a wiring harness. This is how they are sold stock in Europe and Canada.
  • Simply run one wire from your coil to your points, and another wire from your condenser to the points. The decompression becomes your kill switch.
  • If you do want a kill switch, just run the wire from the condenser through a switch, then to the points.
  • A grounding wire from the stator directly to the frame may allow a stronger spark.
  • If running an external mount condenser, be sure it is properly grounded to the frame. The swingarm may not provide a good enough ground.
  • The MVL model featured 6 volt CDI ignition on a different crankshaft. Peugeot 103 have 2 different crankshaft ignition side tapers. One is LARGE TAPER, for POINTS AND CONDENSER. The other is SMALL TAPER for ELECTRONIC IGNITION.

Wiring diagrams

Please see Peugeot wiring diagrams

Performance

  • The 103 are great mopeds, and can be very easily set up to ones desire.
  • Whether you like a strong 70cc for daily drives, or a insane liquid cooled 50cc, there are many ways to set up your bike!

This guide is not everything available, but just a small list of the options for the 103.

Cylinders

Exhausts

Belts

Different variators use different belts to fully exploit the facilitation of the variated motor. Be sure to use the belt that correspods to your variator. For example, use a Doppler belt with your Doppler variator/clutch pulley. Use a Malossi belt with your Multivar variator 103belts.jpg

martysgarage has a great writeup on belt cross reference. [2]

Manuals and External Links