Vespa 100 - upgrade tips required

[Carl]

I am in the process of upgrading my Vespa 100 sport - I just want it to go at a good speed and be reliable, so I have a few questions before I spend too much on things that won't fit:

So, to move it a little quicker - a couple more CCs are needed. Perhaps a DR130 head:
www.sip-scootershop.com/en/product/racing-cylinder-dr-130-cc_10008000?cr=3a6304bb-cc81-4ed5-9f63-1ff45fe1abfa&gad=1&gclid=EAIaIQobChMI_6X7rqv6_gIVTKvVCh2x_w6qEAQYASABEgIBVPD_BwE

Any other options recommended?
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I want to change the gearing from three to four - is this the best option and will I need anything else?

www.sip-scootershop.com/en/product/gearbox-kit-58-54-50-46-teeth-4-gear-pk_13490700?q=Gear%20Box

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Can I get away with keeping the old carb or do I need a something like a Polini CP21?

www.sip-scootershop.com/en/product/carburettor-polini-cp-21-round-slider_20121030?q=Polini%20CP21%20carb

... ... ..

I suppose I will need a new exhaust - so is the Polini Snail good value?

www.sip-scootershop.com/en/product/racing-exhaust-polini-original-polini-evolution-cylinder_2002034R?q=Polini%20snail%20exhaust

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Is there anything else?

[gugne]

DR is good solid plug and play kit

Someone on here might have a good spare gearbox to sell instead of buying new.
You might also want to change your primary gear.
I think a 24 carb might be better. Henri knows more than me and he can advise you better.
Polini banana is also good. I think I might have one in the garage.

Might want to upgrade the clutch: Newfren corks and a Polini wave spring possibly.
Change it to 12v with a new stator? VMC are good and not silly expensive. You'll need to change switches and bulbs as well though.

[henri]

where in the world are you ,as if in uk i can get you all that stuff a damm sight cheaper than sip .H

[Carl]

Thanks Henri - I’m based in Somerset (UK) - direct message me and help me save thousands…