It's not always fun when your nickname is "Shit Pump", but that is basically what a CX500 is named. Back in 2012, our German warrior Mark translated a comic about the so-called "Güllepumpe". (Translated to Dutch, so have fun!) Who could have guessed that someone would actually make such a thing! Well, "jostcx" on youtube did. He actually used a CX frame and built in a pump (not the original engine of course) and made it happen.
In case the video fails to play, try this one: