first, sorry for the english but i'm from belgium and my german is very bad..

i am building a vespa V50 with a pk engine with the following setup:

shb 16.16 carburettor

tecnigas chrome banana

polini 75 cilinder

all gearings would be original.

but my question is:

original on a pk engine is a 3.00 primary.

what would the maximum speed be with this primar? or is it better to put a 2.86 in it and what would be the maximum speed then?

greetz,

Cédric

almost all PK50 models have a 4.60 primary and not 3.00, or do you mean your engine has it already built in?

2.86 would be far too long for that setup, i wouldn't even recommend 3.00. best choice would be 3.72 i'd say.

okay thanks, what would be the topspeed with 3.72? greetz, Cédric

depends on your cylinder, there are different versions with different maxrev available (standard, racing, whatever...).

i think with the standard polini and 16.16 carb you'd be around 60-70 "real" km/h. but that's all relative to the peripherals.

depends on your cylinder, there are different versions with different maxrev available (standard, racing, whatever...).

i think with the standard polini and 16.16 carb you'd be around 60-70 "real" km/h. but that's all relative to the peripherals.

okay, thanks for you're help mate ;)

i go look this evening to my standard primar. i will count the tooth so i know what it is, 4,60,...

grt,

cée

I just saw it on the primar (standard) and its 69/15, so it's 4.6.

the best would be then 3.72 of lower?

greetz,

Cédric

for your planned setup should be 3.72 the best choice. with many hills i'd take a 4.19 primary.

thanks!