Modern Vespa

I need a picture of the plug going here. Since I do not know the position of the cables. Please photo of various points of view. To be able to differentiate well the position. thank you very Much.

Vespa at4 150

Hey guys, I'm new to the forum and love this post and the detailed information you have all posted.
I have an 09 Fly 125 and like everyone else I want more grunt out of it. Other than this forum there seems to be limited mod info available for the Leader engine.

I was looking at my first major mod to be the Malossi 190 cylinder kit. I had considered the Piaggio 200 kit but a scooter web site stated:
"We hate this kit and don't recommend it to anyone. In our experience, this kit lowers the compression so much that the bike performs almost as well as a stock 150. The other 200 kit out there, from a well known Italian performance parts manufacturer, appears to be this same kit in the seller's own blue box. Nobody who has bought this kit likes it. It might be an improvement if you live in a country where gasoline is 75 octane, otherwise, it's horrible. Do yourself a favor and get the Malossi kit. It does make a big difference.
PIaggio OEM 200 Cylinder Kit. PI844113 844113"

I see several people here recommending the Piaggio kit. Who has had success with the Piaggio kit? Anyone know if it is as good as the Malossi?

Get the Malossi. That's the better kit.

After 10 years the project is still running good.
I am not happy with the quality of the malossi kit,i suppose that i have to change piston rings as the leak down test said to me.

Dynagrego still here?

Yes,i replied to your message.

any other reports on this ? also : you have a pm.

I have a problem with the rubber intake between carburetor and cylinder head. It is made of soft rubber and cracks under vibrations because there is no support from the other side of the carb. As i said before, i use a filter pod and not the factory filter box that has a hard intake support tube.
I tried to modify an after market intake for the Yamaha Majesty 125, but there is not much space in the bucket under the seat, so i have to decide if I modify the Yamaha's intake or the bucket under the seat.

Coyld the problem be the added stress put on the rubber intake due to the pod.installation The factory intake also supports the carb. Does the pod have something that allows it to be solid mounted. If it is , could you add a rubber gasket to the mount to reduce vibration?

It's difficult to add a support bracket to the pod and there isn't an easy place near it to fasten the support bracket.I have to make a more solid intake to support the weight of the carburetor and the pod.
In the meantime i always win at the race of the traffic light.

can you add something right under the carb bowl to make it more sturdy?
yes i now it's more than one year old topic

I solved the problem by adding 4 gaskets between the rubber intake and the cylinder head.
Now, the PE28 carburetor stays high, and it doesn't touch the cylinder as it vibrates up and down.

This is Great info....
Wish I would have read this before buying the Mallossi 187 B bore kit (for a 02 ET4 150cc). That totally makes sense and is a much better idea... Not to mention you gain the additional real estate..

Did the Liberty 200 have an 4 valve head? I thought I had read somewhere there had been a Leader-based Air cooled motor with a 4 valve head, but never heard anything more about it. Getting the engine to breathe better has always been the weak point. I know you can get a camshaft to address that, but haven't taken that step yet.

My Fly 150 with the 190 kit and Polini upgear will hit 70+mph.

No, 2 valve head...

I thought reviews on the 200cc cylinder were disappointing, likely due to the lower compression ratio compared to the Malossi.

Some years after,Malossi C.D.I. failed. It burned its pins and died into a cloud of bad smelling smoke. I don't know why. Old CDI now works fine.
I had to buy a used electrical harness to take its CDI socket.
Malossi's pins and socket pins were welded together from the high temperature, and i had to break the malossi's plastic part around the pins to take them apart.

That's a bummer, thanks for the update

Project report: 35.000km have passed using Malossi 190cc big bore kit.
Cylinder and piston are okay,like new.
But piston ring gap was 0,50mm(normal 0.15-0.30mm,service limit max 0.40).
So i bought a new malossi piston ring set from ebay and now the gap is 0.25mm.

Hello dynagrego,

I really enjoyed reading your detailed tuning journey. I'm planning to use your experience with carbs and switch my old original Walbro WVF to Keihin PE28 or similar alternatives. Could you share how you managed your throttle cable and choke situation? What I mean is original carb has side throttle, while PE28 has a top mounted throttle cable with 90-120° angle. Did you changed full throttle cable? Or you found a way to use original cable with PE28? And what do you reckon, should I go with 26mm sized for stock 125cc Leader?

Thank you.

For a stock 125 i think that a Keihin PE24 is enough for instant response.
I changed the throttle cable with a bulk one for 2 stroke vespas.
A same cable is used for my PE28 remote choke. I pull its end from the handlebar.