Project Silver Fern, Vespatronic, performance measurement

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Installation of Vespatronic ignition

The Installation of the Vespatronic requires real interpretation work on the subject of electrics.

To make matters worse, the fact that the currently enclosed connection diagram is not correct.

Here you will find the Vespatronig and a large selection of Vespa ignitions

If you were to believe the circuit diagram, you would simply have to put the mass and excitation voltage together and then redistribute them to connections 1 and 2 of the CDI.

From the ignition base plate, it is of course correct to connect red / black to -1- (the wider slot), again connected to green of the wiring harness and blue to -2- (the narrower slot), connected to black of the wiring harness.

There is a great risk of confusion in the cable box, where different colors have to be brought together. We have provided all cables on which there is voltage when the plug-in connections are loosened and the engine is running. The ground connection does not pose a potential danger and can be equipped with a plug.

So that one does not confuse the two cable connections excitation voltage and on-board network, which are each equipped with a plug-in sleeve, one can memorize “blue sea under yellow sun” - well - in practice it works ...

We place the ignition base plate on the later of the two markings as a test.

As soon as we have put all the glory in the cable box and the pole wheel is reassembled, we start the engine to check the ignition timing.

We have already determined and drawn the markings for the OT and from OT 25 ° beforehand by means of a reversal measurement.

Flashed off briefly.

The ignition is at 25 ° at 2000 rpm-1, a good starting point for a run on the test bench.

The goal was to have a 25hp engine, but look at the diagram for yourself.

Without an air filter, the 148 main jet was still OK, with the filter we had to install a 145 and move the NAPE needle by a clip to the 2nd position from the top.

19PS at 6000rpm-1 and 25Nm speak a clear language. Even at 8600rpm-1 there are still over 20Nm and 25HP on the rear wheel. With this power range there should be no gear connection problem. Unfortunately nice…

To get an impression of how fast the whole load could be in the end, we do another run, HP versus km / h.

At 140Km / h there are still 24PS available ...

What do you all mean? Mission accomplished?

Now we just have to attach the rest of the parts and then it's off to the road for a practical test ...

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