Pulse/Lexmoto Adrenaline 125cc Summer main jet

Hi,

Its been a pretty hot day today in the uk and i went out for a ride today.
about 45mins of riding i could feel the bike feeling a bit less powerful as it was getting hot.

Now my question is would up jetting one size maybe help to cool the engine in these conditions?
Stock main jet is 97.5 would it help to up it to 100 main jet maybe?

Any thoughts or advise much appreciated :)

Im running a #105 jet on mine

ADD this http://item.taobao.com/item.htm?id=35631431466 ?