Derestrict LX50 ET2
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Lurker
2012 ET2 LX50
Joined: 06 Jan 2021
Posts: 2
Location: Perth, Australia
Thu Jan 07, 2021 12:49 am quote
Hi all,

Sorry if I'm going over a topic that has been answered before but after a fair amount of searching I can't seem to find an exact answer.

I have recently purchased a used 2012 ET2 LX50 here in Australia. I want to derestrict it to get the most out of it. The ring on the variator has already been removed by the pervious owner. Otherwise the Vespa is standard.

The exhaust has a resonator pipe coming off it. I intend to cut off the resonator pipe and then weld up and use the standard exhaust minus the resonator pipe.

It also has the brass plate between the air filter housing and the carb. I want to remove this plate. I believe I will then need to change the main jet in the carb. Is that correct? If so roughly what size jet should I be using here in Australia?

Also can I do the exhaust mod at one point in time and then do the carb mod later or do I need to do everything at once?

Thanks for your help guys.
Addicted
2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
Joined: 18 Feb 2017
Posts: 664
Location: Deepinnaharta, Texas
Thu Jan 07, 2021 11:28 am quote
Greetings:

Pics please. We like pics.

I have no direct Vespa 2-smoke experience but quite a bit with SA50 Honda Elites. I can say with confidence that if the brass Swiss Cheese plate is removed, the carb will pull more air. This will all but certainly necessitate a larger Main, and probably a bigger Idle jet as well. (Maybe just an air screw adjustment will get you by.) If you modify first the carb and then go through the exhaust, another jet choice will probably be necessary, although perhaps not so big an upsize as for the carb mod alone.
Molto Verboso
Primavera ET3 & PX150 & GTS 300
Joined: 05 Apr 2009
Posts: 1481
Location: Berlin
Thu Jan 07, 2021 10:46 pm quote
From what I've read, you only missed one thing. The needle in the carb can be installed in two positions. But I don't know which is the standard and which is the mod, so you have to figure it out on your own.
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BV 350
Joined: 22 Nov 2016
Posts: 842
Location: Nebraska
Fri Jan 08, 2021 1:39 am quote
Generally
Der Blechfahrer wrote:
From what I've read, you only missed one thing. The needle in the carb can be installed in two positions. But I don't know which is the standard and which is the mod, so you have to figure it out on your own.
Generally the position that holds the needle farther up in the jet is the richer position. Provides somewhat richer mid-range mixture, although the wide-open mixture is still a function of the main jet, mostly.

Might find that the idle mixture needs relatively little fiddling. With the slide/butterfly providing most of the restriction, the carb isn't flowing enough air for the plate to make much difference.

I'd be interested to know how much faster and quicker-accelerating the derestricted scooter is.
Lurker
2012 ET2 LX50
Joined: 06 Jan 2021
Posts: 2
Location: Perth, Australia
Fri Jan 08, 2021 11:23 pm quote
Hi guys,

Thanks for your quick replies.

Unfortunately I'm having some issues uploading pictures. I have the exact setup as shown in these pictures.

https://www.adrenalin-pedstop.co.uk/Tutorials/Tutorial5.aspx

They have used a size 62 main jet but that's in the UK.

So if I do the exhaust mod and change the main jet I should be pretty good to go? Perhaps just some fine tuning with the idle as well?
Addicted
2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
Joined: 18 Feb 2017
Posts: 664
Location: Deepinnaharta, Texas
Sat Jan 09, 2021 7:58 am quote
Good to Go
Greetings:

Yes by Jove I think you've got it. Resize phone pics and send. We like pics.

Honda 72cc Polini with stock Keihin PA carb loves the 90 main; stock 50cc took a 78. But if I screw in a 92, it burbles, stumbles and won't hit 30. So the performance difference can be pretty significant even with a seemingly tiny jet size change. Err to the side of Rich when testing. Keep an eye on head temp if you have a gauge, HIGHLY RECOMMENDED. Check your spark plug 🔌 early and often if not. Lean mixture can burn too hot and seize.

Good luck!
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