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Weight overall won't have a huge effect (see what I did there?). Anyways, I weigh 220ish and my wife is in the 140 bracket and all it does is dull take off a little e bit. Once underway my Buddy 125 will still hit 60mph no problem with both of us on it.
You might have something slowing up the CVT. Heck, the factory could have accidentally installed a restriction. But I doubt that but still check. Spacer between the variator ramps and check the exhaust for a washer, usually at were the exhaust connects to the cylinder.
Wrong weight rollers can slow everything down as well.
Damaged spark plug cap, wrong/crappy quality plug or gap setting/obstruction.
Bad accelerator pump? I had one mess up on my wife's Buddy.
That's all I can think of right now.....
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