Jetting for Vespa Grande

I am on the verge of getting my Vespa Grande going again. Mostly stock, running an SHA 12.12 and a Malossi High Flow Filter. I don't see a number on the jet of the old carb. The new one came with a 48, so I put a 50 in there to start with. Does that seem about right? I have others I can try. I'll know more once I get it started and drive it some. Am I in the ballpark with a 50 jet?

Re: Jetting for Vespa Grande

stock cylinder and stock "grande size" chrome pipe and 12.12 with highflow filter? .... 50 - 52 - 54 jet range (i almost always go with 52)

Re: Jetting for Vespa Grande

Ok, thanks for your help. What is the factory installed jet on a Grande? Is it a 48?

Re: Jetting for Vespa Grande

51

Re: Jetting for Vespa Grande

george boardway /

with expansion chamber 58 59 60

Re: Jetting for Vespa Grande

mine had a 48...ran fine at 1 mile altitude...

Re: Jetting for Vespa Grande

Bad Cadillac™ /

Mine had a 49 with its 12.12.

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