100 nm without a torque wrench

[Dave48]

Are you sure it's 100 nms seems a lot, you do mean the bolts that hold the sprocket to the hub?
A 100nms coverts to 73.76  foot pounds, using a 1/2 drive standard ratchet wrench the most you can get without swinging on it is around 75 foot pounds, ok some will get more but the fitter who told me set up a bolt in a vice and I was within a couple of pounds of it, so it's ok as a guide.
I took my rear sprocket off to paint a few months ago and didn't tighten them up that tight but I did use thread lock.

+1!
Are you SURE that the sprocket retaining bolts should be tightened that amount. Dont have my Fazer workshop manual any more since I sold bike but what are they 6mm or 8mm diameter?
Certainly the rear axle needs a high torque setting something over 100NM from memory but surely not the sprocket bolts? Just recheck book to be on safe side & as already suggested use a dab of blue loctite on the threads.