Stella 4T conversion to 2T

Dierjm · Post by **Dierjm** » Mon Dec 04, 2017 8:41 pm

So how hard could it be? Unbolt the 4T and bolt in a new 2T engine, got to remember to mix oil with gas.
The problem is performance of the 4T sucks and improvement mods are scarce, It seems every thing is available for the 2T. Not to mention the classic Vespa sound.

youkiddin · Post by **youkiddin** » Mon Dec 04, 2017 8:51 pm

look here http://lmlocgb.co.uk/phpBB3/viewtopic.p ... ap#p141671 you may not want to spend the kind of money it going to take and maybe want to look at selling and buying a 150 or 200 vespa p

Dooglas · Post by **Dooglas** » Tue Dec 05, 2017 8:53 pm

How hard could it be? Fairly tough, actually. In order to fit the 4T engine into the Stella body, it was necessary for LML to build a new tubular subframe in the back part of the stamped metal body. It is not a simple bolt in job as the motor mounts are positioned differently.

Dierjm · Post by **Dierjm** » Wed Dec 06, 2017 12:47 am

Well thats a horse of a different color. Well I'm sure I can live with it. I purchased a used head and jug,so I could see what was in the 4T, valve size is pathetic, I have model airplanes with larger valves and ports, I will admit they have a nice port runner but there is lots more room for valves and larger seats in the head, but where the hell can I buy larger valves and seats for a 4T Stella, every thing is a hassle. I will tweak it and leave it as is.

BuddyRaton · Post by **BuddyRaton** » Wed Dec 06, 2017 3:55 pm

4T Stella parts are going to be harder and harder to find and nobody is going to develop aftermarket parts for such a small market.

If you want the good kick in the seat of the pants go 2T P200.

Dierjm · Post by **Dierjm** » Wed Dec 06, 2017 6:21 pm

Wooda coulda shoulda a fool and his money.

BigDaddy SnakeOiler · Post by **BigDaddy SnakeOiler** » Wed Dec 06, 2017 8:46 pm

SIP has a load of LML 200 4T engines which fit into the frame fairly easily.

jimmbomb · Post by **jimmbomb** » Fri Dec 08, 2017 8:28 pm

BigDaddy SnakeOiler wrote:SIP has a load of LML 200 4T engines which fit into the frame fairly easily.

Do they make big bore kits for the LML 200 4t?
That would be something.

BigDaddy SnakeOiler · Post by **BigDaddy SnakeOiler** » Sat Dec 09, 2017 8:20 pm

There is a 221 kit...
https://www.pmtuning.co.uk/po130-0002

Stanza · Post by **Stanza** » Thu Feb 01, 2018 6:32 pm

I can't imagine kitting it will do wonders for your warranty though....what about a better exhaust and opening up the airbox baffles? I know the 2t ones were also pretty down on power from the factory, something to do with EPA restrictions at the time, but that they responded well to some old fashioned tuning

BigDaddy SnakeOiler · Fri Feb 02, 2018 11:54 am

I think I'm at about the max an LML 150 4T can go bolt on.
Airbox removed--RamAir filter
165 Polini Big Bore
22mm Polini carb
22 gear
GPR Exhaust
Tasso race coil

I have to admit, the thing kinda flies. Come summer I'm going to get her dynoed.