Welcome! Interesting bike! There are many members with Grom Like Vehicles (I refer to the mini class of bikes as GLV's) who swap out the stock 125cc engine for 190cc crate engines. There should be many 125cc engines available if you feel the 90cc is inadequate. 
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"They say that life's a carousel, spinning fast you got to ride it well..."
TGB Delivery Scooter 150
TMEC 200 Enduro--carcass is sadly rotting in the backyard
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