I'd imagine keeping costs down is one reason. These new chain systems are pretty bullet proof. Most last a minimum of 20,000++ miles. I believe power transfer is actually more efficient on a chain vs shaft vs belt. It's easy to change chains and sprockets to fit your need.

Compared to the "old chains", these require very little maintenance/tightening. I can't remember anyone reporting a broken chain on this board over the last 10 years, could be wrong.

Beside real motorcycle have chains, always have always will . Some people here have converted to belts and have been happy with them.

jh

"It's not what I say that's important, it's what you hear" Red Auerbach