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lui 50 to 75

Converting a lui 50 to lui 75 specification – with dyno testing of Casa's 80 cc and CP's ONE05 kits

The lui range is not just a ground-breaking design, it is also a hell of a lot of fun to ride. At least as long as the engine is not to original specs. The original 50 cc engine is a pain with 1.5 hp at the crankshaft and a top speed said to be 38.5 km/h / 24 mph.

Compared to the lui 50 the 75 models are a much more grown up affair. The big headlight unit with hi and low beam, a rear brake light and other features make it look much more grown up. And also work like that.

Headlight-50
Headlight 75 Lui

Thanks to the hype and craze about the lui range probably started with the first Lui Dolomiti Experience the spare and tuning part situation is better than ever. And you can easily turn your 50 into the specs of the 75 one.

For more details here is the model history for both models in one link:

model history

We started a wish list with the major components to carry the conversion out:

Wish list
Also in this listing is the new Casa Lambretta 80 cc kit. We did something on that before ->
Drawing original Inocentti
New CASA LAMBRETTA 80cc cylinder for lui and J50 replaces the 75cc X3 Blog SC

DYNO

Finally, we had it on the dyno with the SH20 original carb, air filter box and the lui 75 original exhaust. The SH20 was jetted like this for best performance and reliability:

Main jet:             65
Idle jet:                48
Atomiser:            5899-5

A very good result with the Innocenti prototype turned into reality by Casa Lambretta. Especially considering this test earlier with the 75 cc cylinder kit give a maximum of 4.9 hp at the rear wheel. At here we have on a fresh -not settled in- engine and kit 5.5 hp straight away. 

If you fancy more power on a 50 cc or 75 cc lui engine the Casa Performance ONE05 kit is the way to go. We also tested it with on the lui 75 with original exhaust and the SH20 carb.

With the standard 75 air filter box the jetting of the SH20 was:

Main jet:             76
Idle jet:                45
Atomiser:            5899-5

With a modified 75 air filter to 6T's Tuning Manual spec the jetting of the SH20 was:

Main jet:             85
Idle jet:                50
Atomiser:            5899-5

75 air filters

And on the dyno with the later setup it looked like this:

one05
ONE05 Casa Performance cylinder kit

So some choices here and we have -sadly- not yet tested the ONE35 kit!

So stay tuned!

/by

New electronic ignition for the Lambretta lui & Junior series from Vape!

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Now New!

There are only two original ignitions for the Lambretta lui and Junior series: one for all models with 50 cc displacement 4-pin ignition system from Dansi and for the models with more displacement (lui 75 and J100-125) one 6-pin Ducati ignition.

The power output of both ignitions is very manageable: the Dansi ignition is included 6V / 18 watts and the Ducati version at least with it 6 V / 33 W .

The 50s models have - in a negative sense - absolutely minimal electrics, which usually don't even have a brake light. An upgrade is impossible due to the non-existent performance of this Lambretta alternator.

VAPE

Comparison of the power output of the ignition systems

Ignition Ducati 6-pin J 100, J 125                  6V / 33W

Ignition Ducati 6-pin lui 75                        6V / 33W 

Ignition Dansi 4-pin J 50, lui 50                  6V / 18W 

Ignition Vape lui 50-75, J 50-125           12 V / 110 W

                               vape 80 watts, consider 2.000 U / min

                               vape 110 watts, consider 6.000 U / min

This means that the new lui and Junior Vape ignition is a more than contemporary update 12V and 110 watts Perfomance. In addition, there is the unbeatable advantage of everyone electronic ignition: There are neither capacitors that burn out nor breakers that are subject to wear. Maintenance work and a weak ignition spark are a thing of the past.
Due to the very high ignition energy at low starting speeds, the vape ignition offers better starting behavior. The CDI is suitable for all original and tuned engines with a static ignition timing.

Thanks to the 12 magnets in the magnet wheel and the 9 coils on the ignition base plate, a high current output is available even at low speeds and the flickering of the light when idling is no longer present. The maximum output of the alternator is 110 watts.

This means that the models with 50 cc displacement can also be perfectly upgraded to the features of the larger models such as high and low beams and a brake light. Additional consumers (USB socket, exhaust gas temperature and the like) are of course no problem either.

The ignition magnet wheel is one-piece, manufactured to a high quality and balanced. The fan blades are CNC milled. The design of the fifteen fan blades has been optimized for higher cooling performance. The weight of the magnet wheel with fan blades is 1,2 kg.

Weight of the pole wheels in comparison

Flywheel Ducati 6-pole (Innocent number 00840134) J 100, J 125 1,35 kg

Polrad Ducati 6-pole (Innocenti number 00860038) lui 75 1,35 kg

Polrad Dansi 4-pole (Innocenti number 00860030) J 50, lui 50 1,4 kg

Polrad Vape with CNC milled fan blades lui 50-75, J 50-125 1,2 kg

Here we have put together the essential components - in addition to the ignition - for converting the on-board electrical system from J 50 to J 100 / J125:

Wishlist

A special feature of the J50 models is the limited space available with the original 50 rear light. A flat LED universal rear light can be the solution here.

Parts on J50

When upgrading the lui 50 to lui 75 electrics it looks like this:

Wish list upgrade

The lui 75 terminal board is - so far - only available for the original contact ignitions. When converting to electronic ignitions, all plug connections should be bridged together so that regulated 12 V is available across all of them.

Only green must not be combined with the other colors; here the engine is switched on and off.

lui 75 with share

The 6 volt horns/buzzers can be retained on all models. However, it is important to avoid honking in the future, otherwise the component will be damaged.

Lui and Junior Vape Ignition:

bgm952ASL

Holding plates:

bgm9462KT
bgm94062S
VAPE Lui
/by