Lui 50 tuning.

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Lui 50 tuning.

Post  Giankx on Sun Jan 29, 2017 11:07 am

Hi, i'm going to buy my first LUI 50.
I own largeframes Lambretta, so i'm totally unaware how to tune a Lui and what parts i need.
I know that i can fit j125 internals into a Lui casing and the the plug'nplay solution is a Casa 75 kit.
What can i do if i want to fit a large bore cast iron barrel? Maybe a sunny 100 barrel? Is it possible to swap the original LUI 50 crank conrod with a longer one?

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Re: Lui 50 tuning.

Post  Thackers on Sun Jan 29, 2017 12:18 pm

Not too sure about the Cento/crank idea. Someone might have written about it on here though.
Rimini have a Starstream 125 4 speed complete engine for sale, have you seen that? fortunately for you living in Italy it might be cheaper on postage costs than the U.K market
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Re: Lui 50 tuning.

Post  Giankx on Sun Jan 29, 2017 12:25 pm

Yes, i've seen that, but is not cheap. I can also buy a cheaper j125 3 speeds engine, but i'm not sure if the crank and cylinder will fit LUI 50 casings.

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Re: Lui 50 tuning.

Post  Snails on Fri Feb 03, 2017 1:27 am

you need j 125 crank - that will fit. I used a cento barrel bored out to 125 and cut the skirt off the bottom. Better exhaust port shape apparently...
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Re: Lui 50 tuning.

Post  Giankx on Fri Feb 03, 2017 2:13 pm

Thanks for the advice. I will fit a j125 3 speed crank and a bored out j100 cylinder. Is it possible to fit a LTH reed valve manifold on that cylinder.
Do i need a different pipe for the J100 cylinder or a pipe designed for the Lui will fit?

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Re: Lui 50 tuning.

Post  Thackers on Sat Feb 04, 2017 4:08 am

Hi, if you take a look at a thread on here by Trotsky in the "Projects" pages titled "Latest Project" there's good quality pics on his reed valve work. I always point out this particular thread as the detail and quality are so helpful .
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Re: Lui 50 tuning.

Post  Giankx on Sat Feb 04, 2017 11:05 am

Anyone knows how the sps (scooter passion.be) snake pipes perform?

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Re: Lui 50 tuning.

Post  Snails on Mon Feb 06, 2017 4:02 am

I cant comment on whether can fit read valve. I used sh1/20 on mine

I fitted a Vega style up and over pipe and it fits ok. You will need a bracket for it though as no mounting point on Lui casing.

I think the lui pipe would need some adjusting due to difference in port height
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