T5 Jetting Advice

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Dek
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Posts: 3
Joined: Tue Mar 24, 2020 11:51 am
Main scooter: Vespa T5 classic
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Wed Mar 25, 2020 12:14 am

dek Avatar dek
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Mar 16, 2020 at 3:55pm
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Hi
I am looking for some advice on where to start with the jetting for a T5 malossi 172 with a si 26/26g carburettor also with bgm big box exhaust.
Or is there any online pages with set ups.

Cheers

paul d
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Posts: 292
Joined: Thu Jun 30, 2011 10:00 am
Main scooter: T5 172 Tv 240
Location: Galway Ireland
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Tue Mar 31, 2020 11:07 pm

I'm not sure if this will help but my T5 172 is running on a standard 24/24 with a scorpion exhaust. I've upjetted the main to a 125. I'd say a 125 or 128 main jet would be a good start for your set up, everything else as standard. I couldn't see a big box exhaust needing a bigger main than a scorpion expansion. I've dialled out the mix screw a bit as well and I'm running a 21 tooth clutch. With a sito plus (122 main) mine would pull a 22 tooth clutch. Might be worth a try on yours. They are a great kit but they rattle in a big way! I'm mentioning this to ease your mind for when you hear your engine running for the first time. Smooth they aint!

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