Page 1 of 1

New guy on old Vespa

Posted: Fri Mar 26, 2021 6:53 pm
by Vvanderv
Hi group!

Just got into this forum and there’s so much information! Got a 1971 Vespa primavera 125 USA version on the bench and would need some advice on jetting or maybe I’ve got wrong carburetor!

Re: New guy on old Vespa

Posted: Fri Mar 26, 2021 6:57 pm
by Vvanderv
I have installed those parts and removed material on crankcase intake opening as specified and matched the port hole on head
Crankshaft SERIE PRO
by Worb5

Racing Air Filter POLINI SHB

Intake Manifold POLINI reed valv for SHB

Racing Exhaust POLINI "Banana"


Racing Cylinder POLINI Mono
130 cc


Carburettor DELL'ORTO SHBC
19.19

Clutch ferodo sport

Ignition PINASCO "FLYTECH" 19mm

What jets should I be using!?

Re: New guy on old Vespa

Posted: Sat Mar 27, 2021 9:43 am
by gaz_powell
In my opinion I would move away from that carb and go for a polini cp23 or similar dellorto

Re: New guy on old Vespa

Posted: Sat Mar 27, 2021 2:33 pm
by Vvanderv
Tanks gas_powell!

Can you tell me more and why this one?

Re: New guy on old Vespa

Posted: Thu Apr 15, 2021 9:46 am
by drunkmunkey6969
Hi Bud, welcome aboard. Feel free to re-post the question in the relevant tech section for more responses :)