On the stock mounting bolt on the right hand side, the bolt needs and allen key to loosen it. However, instead of screwing into the motor mount like on the left side, this bolt goes through the motor mount and is held in place by a nut on the other side, above the coolant reservoir.
You'll need to hold the nut in place and crack the bolt loose, or hold the bolt in place and crack the nut loose. Depends on which is easier for you to get to with your given tools. Don't forget to loosen the pinch bolts on the frame as well, otherwise it's going to be REALLY tough to get off.