Re: What is more reliable?
$500 should build a nice motorized bike. Where I come from a Moped needs a license, A motorized bike is illegal, unless electric and under 200w.
a 1978 moped doesn't sound all that more reliable than a $500 motorized bike, plus you can peddle, At 300 lb's maybe a little peddling would be good for him?
I'm less than 135 lb's so I have no idea how a bike would stand up to 300, but I'm sure it's been done before.