Modern Vespa

Advice please. Is it worth putting a SI24/24G carb on a P200E.

I put a 24G on my Rally and would never run anything else.

'74 Rally 200 Vespatronic wiring, with battery, and more... (Post 2695539)

got most the info I needed here:

P200 with a 24/24G T5 carb jetting

I tried the G vs E carbs, in conjunction with the Oops bell-mouth intake and found the G out performed hands down. Here's the rub, the G carb has only one pilot jet available - as supplied - which is why I had to use the plastic bell-mouth to get right jetting for my set-up, which ends up being a huge limiting factor.

The bell design for the G allows the taller E style jets to be used on the G.

That said the standard G idle and 120 air corrector worked great on my Rally with a 125 Main and T5 filter. I will be swapping for the bell but needed a known good setup that could take me to 7500ft and back.

Indeed the reason for using the "G" bell was ability to use the taller 'standard' dellorto pilot jets which gave me the flexibility for using the T5 carburetor on 150 and 200 engines with various set-ups.

I got one spare so all I got to get is the filter and the jets. Thanks for the help

This came up the other day on the Stella owners Faceplant group. There is a UK company that sells short air correctors and idle jets for the 24.24G in various sizes.

https://www.kmtproducts.co.uk/

I'm glad somebody got something out of my thread. I suck at dialing in jetting so i gave up on the 24G carb install. It was a spare one on my shelf, so back on the shelf it went. I switched back to the ol' 24E carb and i'm more than satisfied with its performance. I had the jetting dialed in on my first try in .001 seconds.

I find an EGT to be the most valuable tool to dial in the jetting, or at least not blowing things up trying.