vespadoctor already said you everything about jet.
I think you have the standard carb since you didn’t specified anything else.
You need a bigger carb. I tried Polini 177. The 20, or 24 are too small for what he can do.
…as far as concern the Polini exhaust… I had it and I through it away litterally in the carbage!
Yes you have more power but is way too narrow spread. Low rpm nothing!!!..and LOUD as hell!!!
If you whant to stay right hand by RZ, much better and much more expensive. For more torque you have to go left hand like SIP, Scorpion, JL , but you have to sacrifice the spare tire. All these left hand exhaust are also less loud then RZ right hand.
PS: if somebody need it I have the Kit Polini 28 carb never used, and a Mazzucchelli race crankshaft never used. I sell it half price that i bought. (I’m using bigger things since I opted for reed)
if interested : [email protected]