With a stock xs650 single disc the stock 14 mm M/C works ok. If you really want it to work good an 11 mm M/C is what you want.
The improvement you felt going from the 17 mm to the 14 mm , going to the 11mm will be about that much better.
Leo
The improvement you felt going from the 17 mm to the 14 mm , going to the 11mm will be about that much better.
Leo