the problem i see with the rs 50 is; for me i would need to run it 30 miles, 60 round trip at 70mph, if it tops out at 80mph. thats seems ruff for that little bike.
Man, I've been looking around for a top speed spec on that bike and I cant find anything about it......
Here's a pic of the RS50 speedometer:
But maybe you can find a bike that has a stroker kit, like this one that has been upgraded to a 73cc.
$2,300 --
http://www.craigslist.org/eby/mcy/68982923.html 
