lui 50 to 75

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.

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:

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

Also in this listing is the new Casa Lambretta 80 cc kit. We did something on that before ->


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

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

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

So stay tuned!

Lambretta Lui test stand

The boss has come up with something: Lambretta Lui dyno days!

From the very beginning - since 1992 - the Lambretta has been a fixture in our company Scooter Center. Much has changed in almost three decades. In the 90s it was mainly the GP and, if necessary, other Series 3 models, now the entire range is available from Series 1 and 2, the cardan models and right up to the Lambretta 'Smallframes' * more popular than ever.


Grade the small Lambrettas with 50 cc displacement were until the appearance of the 75 Casa Lambretta cylinder Completely useless at the beginning of 2009 due to the extremely modest driving performance.

CASA LAMBRETTA 75 cc- Lambretta Lui 50 cylinders

Ulfs Lui Lambrettas put to the test

We took the soft lockdown as an opportunity to put part of Ulf's Lui collection through its paces. We were particularly interested in how the 75 cc Casa cylinder against the original Innocenti 75 cc beats.

And were surprised at how good it was 75 cc aluminum cylinder with Nikasil coating.

Im Performance chart In the blue corner you can see a completely original lui 50 C. The performance curve with 2,1 HP "peak" performance you unfortunately have to look for at the height of the torque curve of the two 75s.

The green curve with 4,5 HP at around 5.500 rpm was delivered by an original Vega with an SH20 carburetor.

The red curve is a 75 series Casa engine. The cylinder was fired with the 15 SHA carburetor kit (main nozzle 68). A special feature of the engine is the exhaust of the 75 models, which is unfortunately not available and is very popular.

Lambretta LUI tuning configurator

The LUI motor has been assembled with the help of this configurator:

LUI tuning configurator


The result: an easy-to-drive motor that really enables the lui for everyday use.

If you want to know more about the lui series, you can find it here model history to:

Casa Performance Lui Tuning

If all of this is not enough for you, you should definitely check out the tuning kits and parts from our friends from Rimini from Casa performance occupy:

Casa Performance Lambretta LUI tuning

There is much more possible! But maybe more on that next lui dyno days ...