No need to torque these bolts.............use an allen key, (original Yamaha tool kit has the right size,), always do each bolt up so it sits against the plate snug. Make sure the side-cover has bedded properly all around the case, then go around each bolt and tighten up............personally i always use a 12'oclock, 6'oclock 9'oclock, 3'oclock and in between......and usually tighten up in 2 increments..............If you really need to put more pressure on the allen key use the ring end of a spanner slip over the shaft of the key and add a little more pressure.
May may not be necessary on this side cover but it is a good habit to get into................If 1 bolt is fully tightend up before any other bolt has any pressure on the cover, this can lead to an uneven pressure on the mating surfaces