GZ250 does fine in the Mountains! Hopefully you've taken yours up Angeles Crest or one of the other fun roads in the area.
My Girlfriend owns a GZ250, I fixed it up for her a few years ago and have ridden it from Rocky Mountain National Park to Boulder via HWY 36 and if it can pull me around at 200#s at these grades an altitudes it'll have no problem in CA. I've even seen a GZ250 in Kathmandu Nepal so these little bikes are just fine in the mountains.
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