vespa polini box exhaust jetting tx 200

[tx200bob]

Hi all got a tx 200. The exhaust was original and had seen better days so I bought a vespa polini box part number 200.2020 the scooter centre web site just says 2 to 3 jets bigger than a sip road. Tried a 122 was fine but holding it flat out up a slight hill 60 mph with a full tank it soft ceased I think pulled clutch in and road home a bit more slower was fine felt ok still I did notice exhaust had come loose at manifold when I got home but any one got one think I need 125 have ordered one but was hoping some one else may be running one and have some jetting advice.

[scooterg]

Not a very good intro ?

[ianmartin40]

probably better to start with too big a jet and work your way down, so buy a selection and do it that way, also doing plug chops etc, however this is a try it and see method, proper dyno set up is the correct way to do it but costs and you may not have a dyno local to you.