hi - new to here!

have got a vespa et4 50cc 2007 (import via J+S judging by previous post etc) - it seems to be gradually slowing down bit by bit. Was wors ethis morning when it was very humid, but top speed seems to be v slowly going down.

it has had the variator removed but has orginal (uncut) cdi and jets (although think might get this done soon)

any ideas? Is it just the weather? It has only done 3500 (presumably kilometres as imported speedo etc etc ) so think things like rollers/belt should be ok.

i commute about 20miles/dayon it

thanks!!!

M